RICHARD BIZLEY / SCIENCE PHOTO LIBRARY RICHARD BIZLEY / SCIENCE PHOTO LIBRARY
Coronavirus particles, artwork. Coronaviruses primarily infect the upper respiratory and gastrointestinal tract and can cause the common cold, gastrointestinal infections and SARS (severe acute respiratory syndrome). Coronaviruses are named after the corona (crown) of surface proteins (yellow) that are used to penetrate a host cell.
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