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What is a virus? How do they spread? How do they make us sick?

  • Written by Lotti Tajouri, Associate Professor, Biomedical Sciences, Bond University
NIAID Rocky Mountain Laboratories (RML), U.S. NIH, CC BY-SA

Viruses are the most common biological entities on Earth. Experts estimate there are around 10,000,000,000,000,000,000,000,000,000,000 of them, and if they were all lined up they would stretch from one side of the galaxy to the other.

You can think of them as nature’s own...

Read more: What is a virus? How do they spread? How do they make us sick?