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rickettsia

A Dictionary of Biology | 2004 | Copyright

rickettsia A very small coccoid or rod-shaped Gram-negative bacterium belonging to the phylum Proteobacteria. With one exception, rickettsias are obligate parasites, being unable to reproduce outside the cells of their hosts. Rickettsias can infect such arthropods as ticks, fleas, lice, and mites, through which they can be transmitted to vertebrates, including humans. The group includes the causal agents of Q fever, Rocky Mountain spotted fever, and forms of typhus. The only genus that can be grown in culture outside host cells is Rochalimaea, which includes R. quintana, the causal agent of trench fever.

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Rickettsia

A Dictionary of Plant Sciences | 1998 | | Copyright

Rickettsia (family Rickettsiaceae) A genus of bacteria which can grow only inside the cells of vertebrate or arthropod hosts. The organisms are rod-shaped. The genus includes the causal agents of typhus fever and various other spotted fevers.

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MICHAEL ALLABY. "Rickettsia." A Dictionary of Plant Sciences. 1998. Encyclopedia.com. 27 May. 2012 <http://www.encyclopedia.com>.

MICHAEL ALLABY. "Rickettsia." A Dictionary of Plant Sciences. 1998. Encyclopedia.com. (May 27, 2012). http://www.encyclopedia.com/doc/1O7-Rickettsia.html

MICHAEL ALLABY. "Rickettsia." A Dictionary of Plant Sciences. 1998. Retrieved May 27, 2012 from Encyclopedia.com: http://www.encyclopedia.com/doc/1O7-Rickettsia.html

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Free newspaper and magazine articles

	Rickettsia sp. in Ixodes granulatus ticks, Japan.(LETTERS)(Report) Magazine article from: Emerging Infectious Diseases; 12/1/2008
	Rickettsia felis as emergent global threat for humans.(SYNOPSIS) Magazine article from: Emerging Infectious Diseases; 7/1/2008
	Spotted-fever group Rickettsia in Dermacentor variabilis, Maryland.(Dispatches) Magazine article from: Emerging Infectious Diseases; 8/1/2004