The US is the worst-hit nation with 211,793 deaths and 7,549,429 infections.
According to an official statement, the FDA has determined that the Moderna COVID-19 vaccine has met the statutory criteria for issuance of an emergency use authorisation (EUA).
The Johnson and Johnson vaccine, which works with one dose instead of two, got approval on Saturday, the third vaccine cleared in the country after emergency use authorisation (EUA) was given to two-dose shots from Pfizer and Moderna in December last year.
Facebook chief said he is getting to the bottom of exactly what the UK firm did, and telling everyone who may have been affected.
The move experts said would ban companies from cutting deals for faster service.