Earlier Omicron infection 'protective against BA.4/BA.5 subvariants'

Researchers say the new subvariants 'have greater capacity to escape the immune-system response'

Young and middle-aged adults who were infected with earlier versions of the Omicron variant of SARS-CoV-2 are likely to have strong protection against reinfection with the current dominant strains, new research suggests.

Prior infection with pre-Omicron variants also offered some protection against BA.4/BA.5 reinfection, but the Qatari authors said this was “modest” in comparison.

In a pre-print study published on medRxiv ahead of peer review, the Weill Cornell Medicine-Qatar-led team in Doha used data from some 38,000

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