The coronaviruses that circulate among humans are typically benign, and they cause about a quarter of all common cold illnesses. But occasionally, coronaviruses, like SARS-CoV-2, circulate in an animal reservoir and mutate just enough to where they’re able to start infecting and causing disease in humans.
12-minute video on COVID-19 and the coronavirus that is causing the current pandemic
Updated: Dec 7, 2020