A third dose of the Pfizer/BioNTech COVID-19 vaccine can "strongly" boost protection against the delta variant -- beyond the protection afforded by the standard two doses, suggests new data released ...

Novavax on Wednesday received Food and Drug Administration authorization for a booster dose of its COVID-19 vaccine. Yet unlike the bivalent mRNA vaccines currently on the market, Novavax’s booster ...

Moderna is urging the US Food and Drug Administration to authorize a half-size booster of its Covid-19 vaccine, according to a briefing document posted Tuesday, ahead of a key meeting of the agency's ...

As we move into spring season, immunity gained through earlier COVID-19 vaccination can start to drop. The virus, although no longer causing widespread lockdowns, is still a significant health hazard, ...