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What are viruses anyway, and why do they make us so sick? 5 questions answered

  • Written by Marilyn J. Roossinck, Professor of Plant Pathology and Environmental Microbiology, Pennsylvania State University
Patients infected with COVID-19 rest at a temporary hospital in Wuhan, China, Feb. 17, 2020.Getty Images/Xiao Yijiu

Editor’s Note: You may sometimes have felt like you “have come down with a virus,” meaning that you became sick from being exposed to something that could have been a virus. In fact, you have a virus –...

Read more: What are viruses anyway, and why do they make us so sick? 5 questions answered

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