London, February 4
The world faces around 4,000 variants of the virus that causes Covid, prompting a race to improve vaccines, Britain said on Thursday, as researchers began to explore mixing doses of the Pfizer and AstraZeneca shots in a world first.
Thousands of variants have been documented as the virus mutates, including the so-called British, South African and Brazilian variants which appear to spread more swiftly than others.
British Vaccine Deployment Minister Nadhim Zahawi said it was very unlikely that the current vaccines would not work against the new variants. — Reuters
Experts decode how Covid virus mutates
New York: Scientists have identified a pattern of Covid mutations which enable it to evade the immune system’s antibodies. University of Pittsburgh experts say the virus undergoes selective deletions in parts of its genetic sequence that encode for the shape of its spike protein. PTI