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US authorises fourth coronavirus shot for over 50s as BA.2 subvariant spreads

The United States on Tuesday authorised a fourth dose of either the Pfizer-BioNTech or Moderna Covid-19 vaccines for people 50 and older, as authorities warn of a possible new wave driven by the BA.2 subvariant. The Food and Drug Administration (FDA) said in a statement it had based its decision on emerging evidence that an additional booster, given four months after the last, improved protection against severe Covid-19 and was not associated with new safety concerns. Additionally, people with…

Read the original article at South China Morning Post

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