Booster shots needed against Omicron, new studies show

Booster shots needed against Omicron, new studies show
A dose of the Pfizer vaccine is prepared (AP)

Three studies released on Friday offer more evidence that Covid-19 vaccines are standing up to the Omicron variant, at least among people who received booster shots.

They are the first large US studies to look at vaccine protection against Omicron, health officials said.

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