PBS NewsHour | Clip | How to protect yourself from the new coronavirus strains
There are now several troubling variants of the coronavirus circulating, and a few seem to make the virus more contagious. One variant , the United Kingdom strain, is also more likely to make people sick or to kill them. The CDC believes that strain will become dominant in the U.S. as soon as March. William Brangham reports on what experts say about avoiding exposure.