Beware the spikes: 4,000 Covid variants keep vaccine makers busy
There is confidence, however, that the current formulas will rise to the challenge
There are about 4,000 coronavirus variants around the world prompting vaccine manufacturers, including Pfizer Inc and AstraZeneca Plc, to try to improve their shots, a British minister says.
Thousands of variants of the type of coronavirus that causes Covid-19 have been documented as the virus mutates, including the so-called British, SA and Brazilian variants which appear to spread more swiftly than others.
British vaccine deployment minister Nadhim Zahawi said it was unlikely the current vaccines would not work against the new variants...