U.S. President Joe Biden said Thursday the country had signed deals to acquire 200 million more COVID-19 vaccine doses with Pfizer and Moderna as officials look to immunize the vast majority of the population by July. 

"Just this afternoon, we signed ... final contracts for 100 million more Moderna and 100 million more Pfizer vaccines," Biden said after touring the National Institutes of Health near Washington. "We're now on track to have enough supply for 300 million Americans by the end of July," he added. 

Both vaccines currently authorized for emergency use in the U.S. require two shots. 

The U.S. has logged over 27 million confirmed cases of COVID-19 so far and over 474,000 people have lost their lives, according to the Johns Hopkins University data.

(With input from AFP)