Pfizer Inc. and Moderna Inc. effectively prevented coronavirus infections, not just illness, with substantial protection evident two weeks after the first dose, government researchers said.Two doses of the vaccines provide as much as 90% protection against infection, according to data from U.S.
Centers for Disease Control and Prevention study published Monday. Earlier clinical trials had established that the shots also prevent illness, hospitalizations, and deaths.The study adds to evidence that new vaccines made with messenger RNA technology actually reduce the spread of the virus in real-world conditions.
An earlier study in Israel found a single dose of the Pfizer vaccine reduced infections by as much as 85%.The CDC studied a group of.