FILE - People leave a testing and vaccination clinic for COVID-19, March 30, 2022, in Long Beach, Calif. While many Americans are trying to move on with their lives after two years of the coronavirus pandemic, U.S. health officials are only beginning to decide on a strategy for using the COVID-19 vaccines to stay ahead of the outbreak. A panel of vaccine experts is meeting Wednesday, April 6, 2022 to discuss key questions for future COVID-19 booster campaigns, including how often the shots should be updated against new viral strains and who should get them. (AP Photo/Ashley Landis, file)