The Food and Drug Administration approved a twice-yearly shot that prevented HIV infections in 99.9% of the people who received it in large clinical trials. The drug, developed by Gilead Sciences and called Yeztugo,

The Food and Drug Administration approved Gilead's twice-yearly antiviral drug for preventing HIV. The company and some experts say it is a milestone that could help bring the world closer to ending the decades-long epidemic caused by the virus.