The world faces around 4,000 variants of the virus that causes Covid-19, prompting a race to improve vaccines, Britain said on Thursday, as researchers began to explore mixing doses of the Pfizer and AstraZeneca shots.
from World News Headlines, Latest International News, World Breaking News - Times of India https://ift.tt/2MUnPLE
from World News Headlines, Latest International News, World Breaking News - Times of India https://ift.tt/2MUnPLE
Comments
Post a Comment