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Efficacy of dual vaccination of pandemic H1N1 2009 influenza and seasonal influenza on institutionalized elderly: A one-year prospective cohort study

VaccinationDual VaccinationPreventive MedicineGeriatricsMedicineSeasonal InfluenzaVaccine EfficacyInfluenza VaccineFlu VaccinationPublic HealthVaccine HesitancyPandemic H1n1 2009EpidemiologyEgg-based Vaccine ProductionInfluenza Vaccines