The latest coronavirus boosters target Omicron. Are they safe and effective?

The US Food and Drug Administration has authorised emergency use of two new Covid-19 vaccines by Pfizer-BioNTech and Moderna that target original strains and the BA.4 and BA.5 variants of Omicron, the strain that currently causes more infections than any others. This is the first major revamp of Covid-19 vaccines since they were rolled out in December 2020. The boosters,...

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