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Effectiveness of seasonal 2008–2009, 2009–2010 and pandemic vaccines, to prevent influenza hospitalizations during the autumn 2009 influenza pandemic wave in Castellón, Spain. A test-negative, hospital-based, case–control study

VaccinationInfectious Disease EpidemiologyPreventive MedicineEpidemic IntelligenceCase–control StudyVaccine EfficacyInfluenza VaccineInfluenza HospitalizationsFlu VaccinationMedicineEpidemiologyInfluenza Pandemic WavePandemic ManagementInfluenza Vaccines