Vaccine bills stack up in statehouses across the US FILE - Vaccines are prepared for students during a pop-up immunization clinic at the Newcomer Academy in Louisville, Ky., on Thursday, Aug. 8, 2024. (AP Photo/Mary Conlon, File)
FILE - Protesters gather for a rally against COVID-19 vaccine mandates in front of the Lincoln Memorial in Washington, on Jan. 23, 2022. (AP Photo/Patrick Semansky, File)
FILE - People hold signs against vaccine passports as they participate at the "S.O.S California No Vaccine Passport Rally" at Tongva Park in Santa Monica, Calif., Saturday, Aug. 21, 2021. (AP Photo/Damian Dovarganes, File)
FILE - This photo from Wednesday Aug. 25, 2021, shows teachers protesting against COVID-19 vaccination mandates in New York. (AP Photo/Mary Altaffer, file)
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FILE - Vaccines are prepared for students during a pop-up immunization clinic at the Newcomer Academy in Louisville, Ky., on Thursday, Aug. 8, 2024. (AP Photo/Mary Conlon, File)