VIRUSES MEDICAL MYSTERY BAFFLES SCIENTISTS Post-Tribune (IN) | April 26, 1987 | Copyright, 1987, Post-Tribune. All rights reserved. REPRODUCTION PROHIBITED. (Hide copyright information) Copyright

DRAWING - POST-TRIBUNE ILLUSTRATION BY JOE SORIA

THIS ELECTRONIC VERSION MAY DIFFER SLIGHTLY FROM THE PRINTED VERSION.

A millionth of an inch in diameter, the invaders are so tiny that they can be seen only under the powerful beam of the electron microscope. Despite their size, the specks of protein and nucleic acid known as viruses have earned a reputation as biology's "ultimate parasites."

Long known to be the causes of smallpox, yellow fever, polio, influenza and the common cold, viruses are blamed for nearly 80 percent of all acute illnesses in the United States each year.

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