President Joe Biden’s chief medical adviser discusses the latest on the battle against the coronavirus, including an update on the emerging strains from the U.K. and South Africa. LEARN MORE: What we know so far about COVID-19 variants worldwide: Subscribe…

Drugmaker Moderna said its vaccine works against some emerging variants of the coronavirus. The company released the results of a new study it performed, which wasn’t peer-reviewed. Dr. Ron Elfenbein, the medical director and owner of FirstCall Medical Center, spoke…