By Vijay Kumar Malesu Reviewed by Susha Cheriyedath, M.Sc. Jun 24 2026 In an early-season US analysis of more than 111,000 medically attended illness encounters, updated COVID vaccines showed meaningful added protection against emergency care and hospitalization among immunocompetent adults. Study: I nterim Estimated Effectiveness of 2025-2026 COVID-19 Vaccines in Adults Using a Test-Negative Design . Image Credit: Elena Pimonova / Shutterstock In a recent study published in the journal  JAMA

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