World faces around 4,000 Covid-19 variants: UK vaccine deployment minister

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

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