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Effectiveness of pneumococcal polysaccharide vaccine against pneumonia and cost analysis for the elderly who receive seasonal influenza vaccine in Japan

VaccinationSeasonal Influenza VaccinePreventive MedicinePneumococcal Polysaccharide VaccineVaccine EfficacyCost AnalysisInfluenza VaccineInfection ControlFlu VaccinationMedicineEpidemiologyInfluenza Vaccines