Pfizer, Moderna and Novavax are slated to deliver new single-strain Covid shots targeting the omicron subvariant XBB.1.5 in September.
Pfizer, Moderna and Novavax are slated to deliver new single-strain Covid shots targeting the omicron subvariant XBB.1.5 in September.
Given that all covid vaccines have lost most of their efficacy in just a few months, once a year doesn’t seem like enough.