Weeks ago, we were introduced to a new, mutant version of Covid-19.
Known as b117, this strain was first detected in the UK last September.
By December 9th, it was thought to be responsible for 60% of new infections in London.
Daily Covid-19 Minute: South African Strain In U.S.
CBS 62 Detroit
The first cases of Covid-19 caused by the more contagious South African strain have now been detected in the United States.
