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Influenza vaccination and risk of community-acquired pneumonia in immunocompetent elderly people: a population-based, nested case-control study

VaccinationCommunity-acquired PneumoniaPreventive MedicineGeriatricsNested Case-control StudyInfluenza VaccinationInfectious Respiratory DiseaseVaccine EfficacyInfluenza VaccineInfection ControlPublic HealthVaccine HesitancyMedicineFlu VaccinationEpidemiologyEgg-based Vaccine ProductionInfluenza Vaccines