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An Introduction to Viruses

 

Left: What COVID-19 coronavirus looks like under a microscope. Right: What influenza virus looks like. Image credit: Centers for Disease Control (CDC).

Submitted by Rich Gast, Cornell Cooperative Extension Franklin County

I've heard it said that there are ten million times more viruses on Earth than there are stars in the universe; maybe more. And that scientists estimate that, at any given mome...



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