The FDA is poised to sign off as soon as next 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. Via CNN: 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.