Beware the spikes: 4,000 Covid variants put vaccine makers through their paces
There is confidence, however, that the current formulas will rise to the challenge
04 February 2021 - 20:40
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...
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