8 strains of the coronavirus are circling the globe. Here's what clues they're giving scientists.
The virus mutates so slowly that the virus strains are fundamentally very similar to each other,” said Charles Chiu, a professor of medicine and infectious disease at the University of California, San Francisco School of Medicine.
Different symptoms, same strains
COVID-19 hits people differently, with some feeling only slightly under the weather for a day, others flat on their backs sick for two weeks and about 15% hospitalized. Currently, an estimated 1% of those infected die.
