infectious mononucleosis

mononucleosis, infectious
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Mononucleosis

Mononucleosis

Definition

Infectious mononucleosis is caused by the Epstein-Barr virus, which in teenagers and young adults may result in acute symptoms that last for several weeks. Fatigue and low energy can linger for several months.

Description

Infectious mononucleosis (IM), also called mono or glandular fever, is commonly transmitted among teenagers and young adults by kissing or sexual activity; hence it is sometimes called the "kissing disease."

By age 3540, approximately 95% of the population has been infected with the Epstein-Barr virus (EBV) that causes IM. Although anyone can develop mononucleosis, primary (first) infections commonly occur in young adults between the ages of 15 and 35. Symptoms of IM are particularly common in teenagers. In the developed world, 1520% of people are infected during adolescence and about half of these teens become ill. Among adults, 3050% of those contracting IM become ill. Although males and females are equally susceptible, in the United States whites are 30-fold more likely than blacks to contract IM.

REMEDIES FOR MONONUCLEOSIS
Therapy Description Target symptom
Aromatherapy Add lavender or eucalyptus to a warm bath. Fatigue
Herbal medicine Echinacea; yarrow or edler flower tea Fight infection and fever
Home remedies Rest; drink fluids; gargle with salt water; and massage lower back. Fatigue, dehydration, and sore throat
Mind/body Meditation, biofeedback, and guided imagery. Stress-induced fatigue
Diet Eat fresh fruits and vegetables. Avoid caffeine, sugars, and animal proteins. Strengthen immune system and increase energy
Yoga Cobra pose Fatigue

Typically IM runs its course in 1030 days. However people with weakened or suppressed immune systems, such as AIDS or organ-transplant patients, are especially vulnerable to potentially serious complications from mononucleosis.

Following IM, the EBV remains dormant (latent) in a few cells in the throat and blood for the remainder of one's life. Periodically the virus may reactivate and be transmitted through saliva; however IM symptoms rarely reoccur.

Causes & symptoms

Causes

Infectious mononucleosis is caused by the first infection with the Epstein-Barr virus, also called herpes virus 4. It is one of the most common human viruses and is endemic throughout the world. EBV is a member of the herpes family of DNA viruses. This family of viruses includes those that cause cold sores, chickenpox , and shingles . Most people are infected with multiple strains of EBV. The different EBV strains are found in separate parts of the body: the circulating lymphocytes (white blood cells), cell-free blood plasma, or the oral cavity.

EBV is spread by contact with viral-infected saliva through coughing, sneezing , kissing, or the sharing of items such as drinking glasses, eating utensils, straws, toothbrushes, or lip gloss. Some evidence indicates that in teens and young adults IM is primarily transmitted by sexual intercourse. However EBV is not highly contagious and household members have only a very small risk of infection unless there is direct contact with infected saliva.

Symptoms

Less than 10% of children under age 10 develop symptoms with EBV infection. The incubation period after exposure to EBV is generally about 714 days in children and teens and 3060 days in adults. An infected person can transmit EBV during this period and for as long as five months after symptoms disappear.

The first symptoms of IM are usually general weakness and extreme fatigue. An infected person may require 1216 hours of sleep daily prior the development of other symptoms. IM symptoms are similar to cold or flu symptoms:

  • Fever and chills occurs in about 90% of IM cases. EBV is most contagious during this stage of the illness.
  • An enlarged spleen, causing pain in the upper left of the abdomen, occurs in about 5060% of infections.
  • Sore throat and/or swollen tonsils occurs in less than 50% of mononucleosis infections.
  • Swollen lymph glands (nodes) in the neck, armpits, and/or groin develop in less than 50% of infections.
  • Jaundice (yellowing of the skin and eyes) develops in more than 20% of patients, depending on age, and indicates an inflamed or enlarged liver.
  • A red skin rash, particularly on the chest, occurs in about 5% of infections.
  • loss of appetite
  • stomach pain and/or nausea
  • muscle soreness and/or joint pain
  • headache
  • chest pain
  • coughing
  • rapid or irregular heartbeat

These acute symptoms usually last one to two weeks.

Splenic enlargement generally peaks during the fourth week after symptoms appear and then subsides. However an enlarged spleen may rupture in 0.10.2% of cases, causing sharp pain on the left side of the abdomen. Additional symptoms of a ruptured spleen include light-headedness, a fast heart rate, and difficulty breathing. Splenic rupture most often occurs within the first three weeks and is the most common cause of death from mononucleosis. It requires immediate medical attention and may require emergency surgery to stop the bleeding.

There are other rarebut potentially life-threateningcomplications of mononucleosis:

  • Neurological complications affecting the central nervous system may develop in 12% of infections. Bell's palsy is a temporary condition caused by weakened or paralyzed facial muscles on one side of the face.
  • The heart muscle may become inflamed.
  • A significant number of the body's red blood cells or platelets may be destroyed and there may be reduced number of circulating red and white blood cells.

Diagnosis

A variety of conditions can produce symptoms similar to those of IM; however if cold or flu-like symptoms persist for longer than two weeks, mononucleosis may be suspected. Mononucleosis usually is diagnosed by a blood testcalled a mono spot testthat measures anti-bodies to EBV. Antibodies may not be detectable until the second or third week after the onset of symptoms. The antibodies peak between weeks two and five and can persist at low levels for up to a year.

About 90% of IM cases show a positive mono spot. Infants and young children do not make the type of anti-bodies that are measured by the mono test. If the mono spot is inconclusive, additional blood tests may be performed that measure an increase in the overall number of white blood cells or an increase in abnormal-appearing lymphocytes that make antibodies against EBV. Other tests can identify at least six specific types of EBV anti-bodies that may be present in the blood.

Treatment

The most effective treatment for infectious mononucleosis is rest, followed by a gradual return to normal activities. If the spleen is enlarged, all contact sports, heavy lifting, and jarring activity such as cheerleading, should be avoided until the enlargement has subsided completely. However exercise such as swimming, running, and other non-contact sports may be resumed. Since mononucleosis can involve the liver, it is important not to consume alcohol.

Although there is no cure for mononucleosis, alternative remedies may help the body to fight the infection and relieve symptoms. Medical practitioners recommend eating four to six small daily meals of unprocessed foods, fresh fruits, and vegetables. It is important to drink plenty of water. Meat, sugar, saturated fats, and caffeinated and decaffeinated drinks should be avoided. Gargling with salt water (one half teaspoon in one cup of warm water) or lozenges may relieve a sore throat.

Vitamins A, B-complex, and C, and magnesium, calcium , and potassium supplements can boost the immune system and increase energy levels.

Herbals

Herbal remedies may help treat mononucleosis, although they are unproven:

  • astragalus (Astragalus membranaceus ) for physical weakness
  • cleavers (Galium species) to cleanse the lymphatic system
  • echinacea (Echinacea augustifolia ) to boost the immune system
  • elder (Sambucus nigra ) flower to reduce fever
  • garlic to fight viral infection
  • goldenseal (Hydrastis canadensis ) to relieve sinus congestion
  • slippery elm bark and licorice can be gargled to soothe a sore throat
  • St. John's wort (Hypericum perforatum ) to relieve anxiety and depression
  • vervain (Verbena officinales ) to relieve anxiety and depression and treat jaundice
  • wild indigo (Baptisia tinctoria ) to cleanse the lymphatic system
  • yarrow (Achillea millefolium ) to reduce fever

Other remedies

The following treatments may help relieve symptoms of mononucleosis:

  • acupressure point Lung 6 may boost lung function and the immune system
  • aromatherapy with bergamot, eucalyptus, and lavender essential oils may relieve fatigue and other symptoms
  • Chinese medicine utilizes acupuncture and Xiao Chai Hu Wan (Minor Bupleurum pills) in combination with otherherbs.
  • Homeopathic physicians choose remedies based on a patient's specific symptoms
  • relaxation techniques such as biofeedback, visualization, meditation , and yoga can reduce fatigue by relieving stress

Allopathic treatment

Acetaminophen (Tylenol) or ibuprofen (Advil, Motrin) may relieve symptoms of IM. Aspirin should be avoided because mononucleosis has been associated with Reye's syndromea serious illness in children and teensthat is aggravated by aspirin.

Although antibiotics are ineffective for treating EBV, a sore throat from mononucleosis can be complicated by a streptococcal infection, sinus infection , or an abscess or pocket of infection on the tonsils. Such bacterial infections can be treated with antibiotics. A fiveday course of corticosteroid anti-inflammatory medications (Prednisone) occasionally is prescribed for breathing difficulties caused by swollen tonsils or lymph nodes in the neck or throat.

Prognosis

Most people with IM return to their normal daily routines within two to three weeks, although it may take up to six months for normal energy levels to return.

A large study suggested that EBV infection increases the risk for Hodgkin lymphoma, a highly treatable cancer of the lymphatic system. About one-third of Hodgkin tumors contain EBV and about one in 1,000 young adults with mononucleosis will develop the cancer, typically about four years after IM.

The development of two other rare types of cancerBurkitt's lymphoma and nasopharyngeal carcinomaappears to be associated with EBV. There also is some evidence that people with high levels of antibodies against EBV are at a higher risk of developing multiple sclerosis .

Prevention

Even though IM is not highly contagious, there is no way to completely avoid infection with EBV. In the majority of cases, IM is without symptoms. Furthermore EBV can be transmitted long after the symptoms of infection are gone and, indeed, periodically throughout the remainder of life. Good hygiene, particularly hand washing and the habit of not sharing toothbrushes or eating utensils may help prevent EBV infection.

Resources

BOOKS

Decker, Janet M., et al. Mononucleosis. New York: Chelsea House, 2004.

MononucleosisA Medical Dictionary, Bibliography, and Annotated Research Guide to Internet References. Icon Health Publications, 2004.

PERIODICALS

Ambinder, Richard. "Infection and Lymphoma." New England Journal of Medicine 349 (October 2, 2003): 130911.

Bates, Betsy. "Mononucleosis Means Delaying Contact Sports. (1-3 Months After Symptom Onset.)" Pediatric News 36 (October 2002): 1011.

Cherian, Benny. "Latest Thinking on Glandular Fever." Pulse September 15, 2003: 54.

Sitki-Green, Diane L., et al. "Biology of Epstein-Barr Virus During Infectious Mononucleosis>" Journal of Infectious Diseases 189 (February 1, 2004): 48392.

ORGANIZATIONS

National Institute of Allergy and Infectious Diseases. National Institutes of Health. 6610 Rockledge Drive, MSC 6612, Bethesda, MD 20892-6612. <http://www.niaid.nih.gov>.

OTHER

Epstein-Barr Virus and Infectious Mononucleosis. National Center for Infectious Diseases. Centers for Disease Control and Prevention. October 26, 2002 [cited May 9, 2004]. <http://www.cdc.gov/ncidod/diseases/ebv.htm>.

Infectious Mononucleosis. KidsHealth. October 2001 [cited May 9, 2004]. <http://kidshealth.org/parent/infections/bacterial_viral/mononucleosis.html>.

Margaret Alic, PhD

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Infectious Mononucleosis

Infectious mononucleosis

Definition

Infectious mononucleosis is a contagious illness caused by the Epstein-Barr virus that can affect the liver, lymph nodes, and oral cavity. While mononucleosis is not usually a serious disease, its primary symptoms of fatigue and lack of energy can linger for several months.

Description

Infectious mononucleosis, frequently called "mono" or the "kissing disease," is caused by the Epstein-Barr virus (EBV) found in saliva and mucus. The virus affects a type of white blood cell called the B lymphocyte, producing characteristic atypical lymphocytes that may be useful in the diagnosis of the disease.

The disease typically runs its course in four to six weeks in people with normally functioning immune systems. People with weakened or suppressed immune systems, such as AIDS patients or those who have had organ transplants, are particularly vulnerable to the potentially serious complications of infectious mononucleosis.

Demographics

While anyone, even young children, can develop mononucleosis, it occurs most often in young adults between the ages of 15 and 35 and is especially common in teenagers. The mononucleosis infection rate among college students who have not previously been exposed to EBV has been estimated to be about 15 percent. In younger children, the illness may not be recognized.

Causes and symptoms

The EBV that causes mononucleosis is related to a group of herpes viruses, including those that cause cold sores, chickenpox , and shingles. Most people are exposed to EBV at some point during their lives. Mononucleosis is most commonly spread by contact with virus-infected saliva through coughing, sneezing, kissing, or sharing drinking glasses or eating utensils.

In addition to general weakness and fatigue, symptoms of mononucleosis may include any or all of the following:

  • sore throat and/or swollen tonsils
  • fever and chills
  • nausea and vomiting , or decreased appetite
  • swollen lymph nodes in the neck and armpits
  • headaches or joint pain
  • enlarged spleen
  • jaundice
  • skin rash

Complications that can occur with mononucleosis include a temporarily enlarged spleen or inflamed liver. In rare instances, the spleen may rupture, producing sharp pain on the left side of the abdomen, a symptom that warrants immediate medical attention. Additional symptoms of a ruptured spleen include light-headedness, rapidly beating heart, and difficulty breathing. Other rare, but potentially life-threatening, complications may involve the heart or brain. The infection may also cause significant destruction of the body's red blood cells or platelets.

Symptoms do not usually appear until four to seven weeks after exposure to EBV. An infected person can be contagious during this incubation time period and for as many as five months after the disappearance of symptoms. Also, the virus will be excreted in the saliva intermittently for the rest of their lives, although the individual will experience no symptoms. Contrary to popular belief, the EBV is not highly contagious. As a result, individuals living in a household or college dormitory with someone who has mononucleosis have a very small risk of being infected unless they have direct contact with the person's saliva.

Diagnosis

If symptoms associated with a cold persist longer than two weeks, mononucleosis is a possibility; however, a variety of other conditions can produce similar symptoms. If mononucleosis is suspected, a physician will typically conduct a physical examination, including a "Monospot" antibody blood test that can indicate the presence of proteins or antibodies produced in response to infection with the EBV. These antibodies may not be detectable, however, until the second or third weeks of the illness. Occasionally, when this test is inconclusive, other blood tests may be conducted.

Treatment

The most effective treatment for infectious mononucleosis is rest and a gradual return to regular activities. Individuals with mild cases may not require bed rest but should limit their activities. Any strenuous activity, athletic endeavors, or heavy lifting should be avoided until the symptoms completely subside, since excessive activity may cause the spleen to rupture.

The sore throat and dehydration that usually accompany mononucleosis may be relieved by drinking water and fruit juices. Gargling salt water or taking throat lozenges may also relieve discomfort. In addition, taking over-the-counter medications, such as acetaminophen or ibuprofen, may relieve symptoms, but aspirin should be avoided because mononucleosis has been associated with Reye's syndrome , a serious illness aggravated by aspirin.

While antibiotics do not affect EBV, the sore throat accompanying mononucleosis can be complicated by a streptococcal infection, which can be treated with antibiotics. Cortisone anti-inflammatory medications are also occasionally prescribed for the treatment of severely swollen tonsils or throat tissues.

Prognosis

While the severity and length of illness varies, most people diagnosed with mononucleosis are able to return to their normal daily routines within two to three weeks, particularly if they rest during this time period. It may take two to three months before a person's usual energy levels return. One of the most common problems in treating mononucleosis, particularly in teenagers, is that people return to their usual activities too quickly and then experience a relapse of symptoms. Once the disease has completely run its course, the person cannot be reinfected.

Prevention

Although there is no way to avoid becoming infected with EBV, paying general attention to good hygiene and avoiding sharing beverage glasses or having close contact with people who have mononucleosis or cold symptoms can help prevent infection.

Parental concerns

The main concern for parents of children with mononucleosis is to keep the child resting until he or she fully recovers from the illness. Parents should also be aware of the symptoms of more serious complications of the liver and spleen, and should seek medical attention for a child who complains of severe abdominal pain, light-headedness, rapid heartbeat, or difficulty breathing.

KEY TERMS

Antibody A special protein made by the body's immune system as a defense against foreign material (bacteria, viruses, etc.) that enters the body. It is uniquely designed to attack and neutralize the specific antigen that triggered the immune response.

Herpes virus A family of viruses including herpes simplex types 1 and 2, and herpes zoster (also called varicella zoster). Herpes viruses cause several infections, all characterized by blisters and ulcers, including chickenpox, shingles, genital herpes, and cold sores or fever blisters.

Reye's syndrome A serious, life-threatening illness in children, usually developing after a bout of flu or chickenpox, and often associated with the use of aspirin. Symptoms include uncontrollable vomiting, often with lethargy, memory loss, disorientation, or delirium. Swelling of the brain may cause seizures, coma, and in severe cases, death.

Resources

BOOKS

Jensen, Hal B. "Epstein-Barr Virus." In Nelson Textbook of Pediatrics. Edited by Richard E. Behrman et al. Philadelphia: Saunders, 2004.

Katz, Ben Z. "Epstein-Barr Virus (Mononucleosis and Lymphoproliferative Disorders)." In Principles and Practice of Pediatric Infectious Diseases, 2nd ed. Edited by Sarah S. Long et al. St. Louis, MO: Elsevier, 2003.

PERIODICALS

Auwaerter, P. G. "Infectious mononucleosis: return to play." Medical Clinics of North America 23 (July 2004): 48597.

ORGANIZATIONS

National Institute of Allergy and Infectious Disease. Building 31, Room 7A-50, 31 Center Drive MSC 2520, Bethesda, MD 208922520. Web site: <www.niaid.nih.gov/default.htm>.

Susan J. Montgomery Rosalyn Carson-DeWitt, MD

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Montgomery, Susan; Carson-DeWitt, Rosalyn. "Infectious Mononucleosis." Gale Encyclopedia of Children's Health: Infancy through Adolescence. 2006. Encyclopedia.com. 24 May. 2016 <http://www.encyclopedia.com>.

Montgomery, Susan; Carson-DeWitt, Rosalyn. "Infectious Mononucleosis." Gale Encyclopedia of Children's Health: Infancy through Adolescence. 2006. Encyclopedia.com. (May 24, 2016). http://www.encyclopedia.com/doc/1G2-3447200311.html

Montgomery, Susan; Carson-DeWitt, Rosalyn. "Infectious Mononucleosis." Gale Encyclopedia of Children's Health: Infancy through Adolescence. 2006. Retrieved May 24, 2016 from Encyclopedia.com: http://www.encyclopedia.com/doc/1G2-3447200311.html

Infectious Mononucleosis

Infectious Mononucleosis

Definition

Infectious mononucleosis is a contagious illness caused by the Epstein-Barr virus that can affect the liver, lymph nodes, and oral cavity. While mononucleosis is not usually a serious disease, its primary symptoms of fatigue and lack of energy can linger for several months.

Description

Infectious mononucleosis, frequently called "mono" or the "kissing disease," is caused by the Epstein-Barr virus (EBV) found in saliva and mucus. The virus affects a type of white blood cell called the B lymphocyte producing characteristic atypical lymphocytes that may be useful in the diagnosis of the disease.

While anyone, even young children, can develop mononucleosis, it occurs most often in young adults between the ages of 15 and 35 and is especially common in teenagers. The mononucleosis infection rate among college students who have not previously been exposed to EBV has been estimated to be about 15%. In younger children, the illness may not be recognized.

The disease typically runs its course in four to six weeks in people with normally functioning immune systems. People with weakened or suppressed immune systems, such as AIDS patients or those who have had organ transplants, are particularly vulnerable to the potentially serious complications of infectious mononucleosis.

Causes and symptoms

The EBV that causes mononucleosis is related to a group of herpes viruses, including those that cause cold sores, chicken pox, and shingles. Most people are exposed to EBV at some point during their lives. Mononucleosis is most commonly spread by contact with virus-infected saliva through coughing, sneezing, kissing, or sharing drinking glasses or eating utensils.

In addition to general weakness and fatigue, symptoms of mononucleosis may include any or all of the following:

  • Sore throat and/or swollen tonsils
  • Fever and chills
  • Nausea and vomiting, or decreased appetite
  • Swollen lymph nodes in the neck and armpits
  • Headaches or joint pain
  • Enlarged spleen
  • Jaundice
  • Skin rash.

Complications that can occur with mononucleosis include a temporarily enlarged spleen or inflamed liver. In rare instances, the spleen may rupture, producing sharp pain on the left side of the abdomen, a symptom that warrants immediate medical attention. Additional symptoms of a ruptured spleen include light headedness, rapidly beating heart, and difficulty breathing. Other rare, but potentially life-threatening, complications may involve the heart or brain. The infection may also cause significant destruction of the body's red blood cells or platelets.

Symptoms do not usually appear until four to seven weeks after exposure to EBV. An infected person can be contagious during this incubation time period and for as many as five months after the disappearance of symptoms. Also, the virus will be excreted in the saliva intermittently for the rest of their lives, although the individual will experience no symptoms. Contrary to popular belief, the EBV is not highly contagious. As a result, individuals living in a household or college dormitory with someone who has mononucleosis have a very small risk of being infected unless they have direct contact with the person's saliva.

Diagnosis

If symptoms associated with a cold persist longer than two weeks, mononucleosis is a possibility; however, a variety of other conditions can produce similar symptoms. If mononucleosis is suspected, a physician will typically conduct a physical examination, including a "Monospot" antibody blood test that can indicate the presence of proteins or antibodies produced in response to infection with the EBV. These antibodies may not be detectable, however, until the second or third weeks of the illness. Occasionally, when this test is inconclusive, other blood tests may be conducted.

Treatment

The most effective treatment for infectious mononucleosis is rest and a gradual return to regular activities. Individuals with mild cases may not require bed rest but should limit their activities. Any strenuous activity, athletic endeavors, or heavy lifting should be avoided until the symptoms completely subside, since excessive activity may cause the spleen to rupture.

The sore throat and dehydration that usually accompany mononucleosis may be relieved by drinking water and fruit juices. Gargling salt water or taking throat lozenges may also relieve discomfort. In addition, taking over-the-counter medications, such as acetaminophen or ibuprofen, may relieve symptoms, but aspirin should be avoided because mononucleosis has been associated with Reye's syndrome, a serious illness aggravated by aspirin.

While antibiotics do not affect EBV, the sore throat accompanying mononucleosis can be complicated by a streptococcal infection, which can be treated with antibiotics. Cortisone anti-inflammatory medications are also occasionally prescribed for the treatment of severely swollen tonsils or throat tissues.

Prognosis

While the severity and length of illness varies, most people diagnosed with mononucleosis will be able to return to their normal daily routines within two to three weeks, particularly if they rest during this time period. It may take two to three months before a person's usual energy levels return. One of the most common problems in treating mononucleosis, particularly in teenagers, is that people return to their usual activities too quickly and then experience a relapse of symptoms. Once the disease has completely run its course, the person cannot be re-infected.

KEY TERMS

Antibody A specific protein produced by the immune system in response to a specific foreign protein or particle called an antigen.

Herpes viruses A group of viruses that can cause cold sores, shingles, chicken pox, and congenital abnormalities. The Epstein-Barr virus which causes mononucleosis belongs to this group of viruses.

Reye's syndrome A very serious, rare disease, most common in children, which involves an upper respiratory tract infection followed by brain and liver damage.

Prevention

Although there is no way to avoid becoming infected with EBV, paying general attention to good hygiene and avoiding sharing beverage glasses or having close contact with people who have mononucleosis or cold symptoms can help prevent infection.

Resources

ORGANIZATIONS

National Institute of Allergy and Infectious Disease. Building 31, Room 7A-50, 31 Center Drive MSC 2520, Bethesda, MD 20892-2520. (301) 496-5717. http://www.niaid.nih.gov/default.htm.

OTHER

"Communicable Disease Fact Sheet." New York State Department of Health.

"Mononucleosis: A Tiresome Disease." Mayo Clinic Online. http://www.mayo.ivi.com/mayo/9701/htm/mono.htm.

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Mononucleosis, Infectious

Mononucleosis, infectious

Infectious mononucleosis is an illness caused by the Epstein-Barr virus . The symptoms of "mono," as the disease is colloquially called, include extreme fatigue, fever, sore throat, enlargement of the lymph nodes in the neck, armpit, and throat, sore muscles, loss of appetite, and an enlarged spleen. More infrequently, an individual will experience nausea, hepatitis , jaundice (which indicates malfunction of the liver), severe headache, chest pain, and difficulty breathing. Children may display only a few or none of these symptoms, while all can be present in adolescents.

The illness can be passed from person to person via the saliva. In adolescents, mononucleosis was once known as "the kissing disease" since kissing is a route of transmission of the Epstein-Barr virus. Given the relative ease of transmissions, epidemic outbreaks of mononucleosis can occur in environments such as schools, hospitals and the workplace.

Infectious mononucleosis is usually self-limiting. Recovery occurs with time and rest, and is usually complete with no after effects. Analgesics can help relieve the symptoms of pain and fever in adults. However, children should avoid taking aspirin, as use of the drug in viral illnesses is associated with the development of Reye syndrome, which can cause liver failure and even death.

Recovery from mononucleosis is not always complete. In some people there can be a decrease in the number of red and white blood cells, due either to damage to the bone marrow (where the blood cells are produced) or to enhanced destruction of the red blood cells (a condition known as hemolytic anemia). Another temporary complication of the illness is weakened or paralyzed facial muscles on one side of the face. The condition, which is called Bell's palsy, leaves the individual with a drooping look to one side of the face. Much more rarely, very severe medical complications can arise. These include rupture of the spleen, swelling of the heart (myocarditis), malfunction of the central nervous system, and Guillain-Barré syndrome. The latter condition is a paralysis resulting from disruption of nervous system function.

The illness is diagnosed in a number of ways. Clinically, the presence of fever, and inflammation of the pharynx and the lymph nodes are hallmarks of the illness. Secondly, the socalled "mono spot" test will demonstrate an elevated amount of antibody to the virus in the bloodstream. A third diagnostic feature of the illness is an increase in the number of white blood cells. These cells, which are also called lymphocytes, help fight viral infections.

Antibodies to the Epstein-Barr virus persist for a long time. Therefore, one bout of the illness usually bestows long-lasting immunity in an individual. Testing has demonstrated that most people have antibodies to the Epstein-Barr virus. Thus, most people have been infected with the virus at some point in their lives, but have displayed only a few minor symptoms or no symptoms at all. Many children are infected with the virus and either display no symptoms or become transiently ill with one of the retinue of infections acquired during the first few years of life. When the initial infection occurs during adolescence, the development of mononucleosis results 3550% of the time. Understanding of the reasons for this failure to infect could lead to a vaccine to prevent infectious mononucleosis. As of 2002, there is no vaccine available.

The Epstein-Barr virus that is responsible for the illness is a member of the herpesvirus family. The virus is found all over the world and is one of the most common human viruses . In infectious mononucleosis, the virus infects and makes new copies of itself in the epithelial cells of the oropharynx. Also, the virus invades the B cells of the immune system .

For most patients, the infection abates after two to four weeks. Several more weeks may pass before the spleen resumes its normal size. A period of low activity is usually prescribed after a bout of mononucleosis, to protect the spleen and to help energy levels return to normal.

Epstein-Barr virus is usually still present after an infection has ended. The virus becomes dormant in some cells of the throat, in the blood, and in some cells of the immune system. Very rarely in some individuals, the latent virus may be linked to the appearance years later of two types of cancers; Burkitt's lymphoma and nasopharyngeal carcinoma.

See also Viruses and responses to viral infection

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mononucleosis, infectious

infectious mononucleosis (mŏn´ənōō´klēō´sĬs), acute infectious disease of older children and young adults, occurring sporadically or in epidemic form, also known as mono, glandular fever, and kissing disease. The causative organism is a herpesvirus known as Epstein-Barr virus. The disease occurs most often in patients between the ages of 15 and 35. The virus is present in the saliva; it is usually spread by sharing a glass or kissing. Symptoms usually take 30 to 50 days to develop.

Diagnosis of mononucleosis follows the exhibition of a large number of abnormal white blood cells (lymphocytes) on microscopic blood examination. These blood cells have a single nucleus that give the disease its name. Symptoms are varied but include enlarged lymph nodes, sore throat, fever, enlarged spleen in about half the cases, and excessive fatigue. Occasional rashes and throat and mouth infections occur. Liver inflammation is common. Fatalities are very rare and, when they do occur, usually result from splenic rupture. General therapeutic measures include bed rest and treatment of symptoms.

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"mononucleosis, infectious." The Columbia Encyclopedia, 6th ed.. 2016. Encyclopedia.com. 24 May. 2016 <http://www.encyclopedia.com>.

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Infectious Mononucleosis

INFECTIOUS MONONUCLEOSIS

DEFINITION


Infectious mononucleosis (pronounced MON-o-NOO-klee-O-siss) is a contagious (catching) illness caused by the Epstein-Barr virus (EBV). The virus most commonly infects the liver, lymph nodes, and mouth. Mononucleosis is usually not a serious disease. However, its major symptomsfatigue and lack of energycan linger for several months. Infectious mononucleosis is also known as "mono" or "the kissing disease."

DESCRIPTION


Anyone can have infectious mononucleosis. However, the disease is most common in young adults between the ages of fifteen and thirty-five. It is especially common among teenagers. The rate of mononucleosis among college students has been estimated at 15 percent. The disease is often not recognized when it occurs in young children.

Infectious Mononucleosis: Words to Know

Herpes viruses:
A group of viruses that cause cold sores, chickenpox, shingles, and other diseases.
Reye's syndrome:
A very serious, rare disease, most common in children, believed to be caused by aspirin.

In people who are otherwise healthy, mononucleosis usually lasts about four to six weeks. In people with weakened immune systems, the disease may last much longer. AIDS patients (see AIDS entry) and people who have had organ transplants often have weakened immune systems. In such cases, serious complications may develop after a bout of mononucleosis.

CAUSES


The EBV that causes mononucleosis is related to the herpes viruses (see herpes infections entry). The herpes viruses are responsible for infectious diseases such as cold sores, chickenpox (see chickenpox entry), and shingles. Most people are exposed to EBV at some point in their lives. The virus is spread through contact with saliva from an infected person. It can be transferred by coughing, sneezing, kissing, or sharing of drinking glasses or eating utensils.

SYMPTOMS


The most prominent symptoms of mononucleosis are weakness and fatigue. Some other common symptoms include:

  • Sore throat and/or swollen tonsils
  • Fever and chills
  • Nausea and vomiting
  • Decreased appetite
  • Swollen lymph nodes in the neck and armpits
  • Headaches or joint pain
  • Enlarged spleen
  • Jaundice
  • Skin rash

Serious complications of mononucleosis include an enlarged spleen or inflamed liver. In rare cases, the spleen may rupture (break open), producing sharp pains on the left side of the abdomen. This symptom calls for immediate medical attention. Other symptoms of a ruptured spleen include light-headedness, rapid heartbeat, and difficulty breathing. Other rare complications include damage to the heart, brain, or the body's red blood cells.

Symptoms usually do not appear until four to seven weeks after exposure to EBV. Even though symptoms have not appeared, an infected person is still contagious. That is, he or she can pass the disease on to another person. An infected person remains contagious for up to five months after symptoms have disappeared.

EBV is actually not very contagious. People can live in close contact with an infected person without catching the disease as long as they do not have direct contact with that person's saliva.

DIAGNOSIS


The symptoms of mononucleosis are similar to those of other diseases. If mononucleosis is suspected, a doctor may conduct a complete physical examination. The examination will usually include a test known as the "Monospot" antibody blood test. This test can pick out chemicals in a person's blood that the body has produced to fight off mononucleosis. Other blood tests are also available to confirm a diagnosis of mononucleosis.

TREATMENT


The most effective treatment for mononucleosis is rest because a person's body needs time to fight off the infection. Individuals with mild cases may not require bed rest, but they should restrict their physical activity. In any case, vigorous physical activity, such as athletics or heavy lifting, should be avoided. Such activities can cause the spleen to rupture, making the condition much more serious.

Treatments are available for the symptoms of mononucleosis. For example, drinking water and fruit juices can help relieve the sore throat and dehydration that often accompany mononucleosis. Gargling with salt water or taking throat lozenges may also relieve discomfort. Over-the-counter medications, such as acetaminophen (pronounced uh-see-tuh-MIN-uh-fuhn, trade name Tylenol) or ibuprofen (pronounced i-byoo-PRO-fuhn, trade name Advil), may relieve symptoms such as fever and headache. Aspirin should not be given to children because it may cause Reye's syndrome (see Reye's syndrome entry), a serious illness.

Antibiotics are not effective in curing mononucleosis. However, they may be helpful in treating some symptoms of the disease. For example, they may help relieve the discomfort of the sore throat that often occurs with mononucleosis. Cortisone can also be used to reduce swelling and inflammation in the throat and tonsils.

PROGNOSIS


Most people recover from mononucleosis in about two to three weeks. They are then able to resume their normal activities, especially if they rested during their illness. A patient may not feel completely recovered, however, for a period of up to three months after being cured.

One of the most common problems in treating mononucleosis is that people are eager to return to their usual activities too quickly. When that happens, the disease may return. Once the disease has completely run its course, a person cannot be reinfected.

PREVENTION


There is no guaranteed way to avoid becoming infected with EBV. However, some simple rules of good hygiene can reduce a person's chance of catching the disease. For example, one should avoid sharing utensils and drinking glasses with someone who has cold symptoms.

FOR MORE INFORMATION


Books

Silverstein, Alvin, Virginia Silverstein, and Robert Silverstein. Mononucleosis. Hillside, NJ: Enslow Publishers, 1994.

Smart, Paul. Everything You Need to Know About Mononucleosis. New York: Rosen Publishing Group, 1998.

Zonderman, Jon. Mononucleosis and Other Infectious Diseases. New York: Chelsea House Publishers, 1989.

Organizations

National Institute of Allergy and Infectious Diseases. Building 31, Room 7A-50, 31 Center Drive, MSC 2520, Bethesda, MD 208922520. http://www.niaid.nih.gov.

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Mononucleosis, Infectious

Mononucleosis, Infectious

What Is Mononucleosis?

How Common Is Mononucleosis?

How Is Mononucleosis Spread?

How Do People Know They Have Mononucleosis?

How Is Mononucleosis Diagnosed and Treated?

What Are Some Complications of Mononucleosis?

Can Mononucleosis Be Prevented?

Resources

Infectious mononucleosis (mah-no-nu-klee-O-sis), also known as mono, is an infectious illness usually caused by the Epstein-Barr (EP-steen BAR) virus (EBV). It often leads to fever, sore throat, swollen lymph nodes*, and tiredness.

*lymph
(LIMF) nodes are small, bean-shaped masses of tissue that contain immune system cells that fight harmful microorganisms. Lymph nodes may swell during infections.

KEYWORDS

for searching the Internet and other reference sources

Burkitts lymphoma

Cytomegalovirus

Epstein-Barr virus (EBV)

Mono

What Is Mononucleosis?

By the time they are 40, as many as 95 percent of adults in the United States have evidence in their blood of a previous EBV infection. Many of these infections are never recognized, especially if they occur in early childhood, because the symptoms look like those of other childhood viral illnesses. Some people infected with EBV have no symptoms. This occurs in many parts of the world where most people are infected early in life. In the United States, EBV infection is most common during adolescence and early adulthood (ages 15 to 25). One-third to one-half of teens who come into contact with the virus for the first time will develop symptoms of classic infectious mono: sore throat, swollen lymph nodes, fever, and extreme tiredness.

Mono most often is associated with acute* infection by EBV, but it is sometimes seen with acute cytomegalovirus* (CMV) infection, acute HIV* infection, and, rarely, other viruses.

*acute
describes an infection or other illness that comes on suddenly.
*cytomegalovirus
(sy-tuh-MEH-guh-lo-vy-rus), or CMV, infection is very common and usually causes no symptoms. It poses little risk for healthy people, but it can lead to serious illness in people with weak immune systems.
*HIV ,
or the human immunodeficiency (HYOO-mun ih-myoo-no-dih-FIH-shen-see) virus, is the virus that causes AIDS (acquired immunodeficiency syndrome).

Although the symptoms may be unpleasant, mono is generally a mild disease. After a person recovers, the virus remains dormant (inactive) in the body for life. It occasionally may reactivate but it rarely causes symptoms again. When people have been infected with the virus, whether or not they had symptoms, they usually will be immune* to future EBV-related illness.

*immune
(ih-MYOON) means resistant to or not susceptible to a disease.

How Common Is Mononucleosis?

EBV is one of the most common human viruses in the world. In the United States, cases of mono with symptoms most often are found in teens between the ages of 15 and 17. The illness occurs in 2 out of every 1,000 adolescents and young adults and is less common in other age groups.

How Is Mononucleosis Spread?

Mono is contagious, although less so than the common cold. EBV passes from person to person primarily through contact with saliva. Kissing and sharing food, drinks, or utensils commonly spread the virus. Although EBV is present in the respiratory tract*, it usually is not transmitted by coughing or sneezing. Some people will become sick and be able to spread the virus for weeks, especially those who are infected but do not feel sick

*respiratory tract
includes the nose, mouth, throat, and lungs. It is the pathway through which air and gases are transported down into the lungs and back out of the body.

and pass the virus to others without realizing it. The virus usually remains inactive after the first infection, but some people may spread it from time to time throughout their life.

How Do People Know They Have Mononucleosis?

Symptoms of mono develop between 4 and 6 weeks after infection and generally last 2 to 4 weeks. These include swollen lymph nodes, extreme tiredness, fever, sore muscles, and sore throat. Up to 50 percent of people with classic infectious mononucleosis will have a swollen spleen, and some will have an enlarged liver. Other symptoms may include loss of appetite, weakness, nausea (NAW-zee-uh), stiffness, headache, chest pain, and, rarely, jaundice*.

*jaundice
(JON-dis) is a yellowing of the skin, and sometimes the whites of the eyes, caused by a buildup in the body of bilirubin, a chemical produced in and released by the liver. An increase in bilirubin may indicate disease of the liver or certain blood disorders.

How Is Mononucleosis Diagnosed and Treated?

Symptoms of mono usually show up 1 to 4 weeks before the diagnosis is made. A physical exam, the patients age, and sometimes a history of contact with an infected person help the doctor make the diagnosis. An adolescent patient with a lasting fever, sore throat, and swollen lymph nodes, with or without an enlarged spleen, is likely to have mono.

Blood tests will confirm the diagnosis. A blood count will show an increased number of lymphocytes*, and many of them will look unusual. A positive rapid screening test may confirm the diagnosis by revealing EBV in the blood, but this test can be negative, especially early in the illness. More accurate antibody* testing may be done to rule out other viruses that can cause mono-like illnesses. Antibody testing checks several antibodies to determine if there is a current infection or evidence of past infection.

*lymphocytes
(LIM-fo-sites) are white blood cells, which play a part in the bodys immune system, particularly the production of antibodies and other substances to fight infection.
*antibody
(AN-tih-bah-dee) is a protein molecule produced by the bodys immune system to help fight a specific infection caused by a microorganism, such as a bacterium or virus.

There is no specific treatment for mono. Because it is a viral illness, antibiotics are not prescribed unless a secondary bacterial illness is present, such as strep throat. The best treatment for mono is rest. Over-the-counter medications such as acetaminophen (uh-see-teh-MIH-noh-fen) or ibuprofen may be taken to relieve fever and pain.

Steroids, medications that reduce inflammation, may be given to decrease swelling in the tonsils* and lymph nodes in the neck if a patient is experiencing difficulty swallowing or breathing. Playing contact sports is prohibited for someone who has mono because when the spleen and liver enlarge, they are more vulnerable to injury. Patients with mono are advised not to play contact sports for at least 1 month and to be examined and get a doctors permission before they start again.

*tonsils
are paired clusters of lymphatic tissue in the throat that help protect the body from bacteria and viruses that enter through a persons nose or mouth.

Symptoms of mono usually clear up 1 to 2 months after they appear, but they can last as long as 4 months.

Kiss and Tell

Mono often is referred to as the kissing disease because the infection is spread primarily through direct contact with infected saliva.

What Are Some Complications of Mononucleosis?

Recovery from mono is usually uneventful, but sometimes complications occur. An enlarged spleen may rupture, which is an emergency that needs surgery. Fifty percent of patients with infectious mononucleosis will have some liver inflammation, but only a small number will have significant inflammation, or hepatitis (heh-puh-TIE-tis). Blood problems that can result from the infection include anemia*, decreased white cells (cells that fight infection), and low numbers of platelets (cells that help the blood clot). Mononucleosis also can lead to encephalitis (en-seh-fuh-LYE-tis, inflammation of the brain), Guillain-Barre (GEE-yan bah-RAY) syndrome (an inflammation of the nerves, which causes muscle weakness and paralysis*), and Bells palsy (PAWL-zee, a temporary weakness or paralysis of the muscles on one side of the face). Myocarditis (my-oh-kar-DYE-tis, an inflammation of the muscular walls of the heart) is a rare complication.

*anemia
(uh-NEE-me-uh) is a blood condition in which there is a decreased amount of oxygen-carrying hemoglobin in the blood and, usually, fewer than normal numbers of red blood cells.
*paralysis
(pah-RAH-luh-sis) is the loss or impairment of the ability to move some part of the body.

EBV and Cancer

EBV has been linked to the development later in life of Burkitts lymphoma (a rare blood disease of the lymph nodes seen mainly in Africa) and nasopharyngeal carcinoma (nay-zo-fair-in-JEE-ul kar-sih-NO-muh, a cancer in the throat area seen mainly in China). EBV also is linked to lymphoma in the United States, most notably in people with weakened immune systems, such as people who have HIV.

EBV also has been associated with cancers, such as lymphoma*, especially in patients with weak immune systems, such as people who have had organ transplants or who have HIV.

*lymphoma
(lim-FO-muh) refers to a cancerous tumor of lymphocytes, cells that normally help the body fight infection.

Can Mononucleosis Be Prevented?

There is nothing specific that a person can do to avoid contracting mono because EBV often is spread in the saliva of healthy people who have been infected in the past and who can still transmit the virus. Normal human behavior makes it practically impossible to prevent the spread of the disease.

See also

AIDS and HIV Infection

Cytomegalovirus (CMV) Infection

Encephalitis

Hepatitis, Infectious

Myocarditis/Pericarditis

Resources

Organizations

U.S. Centers for Disease Control and Prevention (CDC), 1600 Clifton Road, Atlanta, GA 30333. The CDC is the U.S. government authority for information about infectious and other diseases. It posts information about mononucleosis at its website.

Telephone 800-311-3435 http://www.cdc.gov

U.S. National Library of Medicine, 8600 Rockville Pike, Bethesda, MD 20894. The National Library of Medicine has a website packed with information on diseases such as mononucleosis, consumer resources, dictionaries and encyclopedias of medical terms, and directories of doctors and helpful organizations.

Telephone 888-346-3656 http://www.nlm.nih.gov

Website

KidsHealth.org. KidsHealth is a website created by the medical experts of the Nemours Foundation and is devoted to issues of childrens health. It contains articles on a variety of health topics, including mononucleosis.

http://www.KidsHealth.org

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mononucleosis

mon·o·nu·cle·o·sis / ˌmänəˌn(y)oōklēˈōsəs/ • n. Med. an abnormally high proportion of monocytes in the blood. ∎ short for infectious mononucleosis. Also called mono.

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mononucleosis

mononucleosis (mon-oh-new-kli-oh-sis) n. the condition in which the blood contains an abnormally high number of mononuclear leucocytes (monocytes and lymphocytes). See glandular fever (infectious mononucleosis).

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"mononucleosis." A Dictionary of Nursing. 2008. Encyclopedia.com. 24 May. 2016 <http://www.encyclopedia.com>.

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infectious mononucleosis

infectious mononucleosis n. see glandular fever.

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mononucleosis, infectious

mononucleosis, infectious See glandular fever

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"mononucleosis, infectious." World Encyclopedia. 2005. Encyclopedia.com. 24 May. 2016 <http://www.encyclopedia.com>.

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mononucleosis

mononucleosisglacis, Onassis •abscess •anaphylaxis, axis, praxis, taxis •Chalcis • Jancis • synapsis • catharsis •Frances, Francis •thesis • Alexis • amanuensis •prolepsis, sepsis, syllepsis •basis, oasis, stasis •amniocentesis, anamnesis, ascesis, catechesis, exegesis, mimesis, prosthesis, psychokinesis, telekinesis •ellipsis, paralipsis •Lachesis •analysis, catalysis, dialysis, paralysis, psychoanalysis •electrolysis • nemesis •genesis, parthenogenesis, pathogenesis •diaeresis (US dieresis) • metathesis •parenthesis •photosynthesis, synthesis •hypothesis, prothesis •crisis, Isis •proboscis • synopsis •apotheosis, chlorosis, cirrhosis, diagnosis, halitosis, hypnosis, kenosis, meiosis, metempsychosis, misdiagnosis, mononucleosis, myxomatosis, necrosis, neurosis, osmosis, osteoporosis, prognosis, psittacosis, psychosis, sclerosis, symbiosis, thrombosis, toxoplasmosis, trichinosis, tuberculosis •archdiocese, diocese, elephantiasis, psoriasis •anabasis • apodosis •emphasis, underemphasis •anamorphosis, metamorphosis •periphrasis • entasis • protasis •hypostasis, iconostasis

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