KNTV NBC Nightly News With Lester Holt February 4, 2021 01:33:00
It could be authorized for use in the u.s >> we have an impact on infection and transmission >> reporter: it comes amid growing concerns over new variants over taking the u.s. this 35-year-old father of two in alabama is one of the first known death from the u.k. mutant strain which researchers believe it is up to 40% infectious >> if they become dominant, we need to upgrade the vaccine, thats the direction we are going right now. >> reporter: the biden administration announced the new federal s...
Source: archive.org