Influenza viruses, seen through an electronic microscope here, have a high mutation rate, which requires the flu vaccine to be updated every year. — Sanofi Pasteur
There are seven coronaviruses – all of which are named as such because of the crown-like spikes on their surfaces.
The common coronaviruses (which are RNA, or ribonucleic acid, viruses) that commonly infect humans are the alpha viruses 229E and NL63, and the beta viruses OC43 and HKU1.
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