A large population study links trimethoprim-sulfamethoxazole to a rare yet nearly threefold higher risk of severe acute respiratory failure in healthy adolescents and young adults, reinforcing FDA warnings and the need for careful monitoring. Two extensive Cochrane reviews—including over 132 million people—confirm that HPV vaccination dramatically reduces cervical cancer, high-grade precancers, and anogenital warts without increasing serious adverse events. Kentucky's deadly pertussis surge highlights declining vaccine coverage and the critical role of maternal Tdap and timely childhood immunization to protect the most vulnerable infants.