The US Food and Drug Administration is poised to sign off as soon as this week on updated Covid-19 vaccines targeting more recently circulating strains of the virus, according to two sources familiar with the matter, as the country experiences its largest summer wave in two years. [KFF News]

The agency is expected to greenlight updated mRNA vaccines from Moderna and Pfizer/BioNTech that target a strain of the virus called KP.2, said the sources, who declined to be named because the timing information isn’t public. It was unclear whether the agency simultaneously would authorize Novavax’s updated shot, which targets the JN.1 strain.

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