Tag Archives: 000 Covid-19 variants emerge as UK explores mixed vaccine shots

LONDON: 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 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 …

Read More »