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RESEARCH PRODUCT

The effectiveness of influenza vaccination in preventing hospitalisations of elderly individuals in two influenza seasons: a multicentre case-control study, Spain, 2013/14 and 2014/15.

Angela DomínguezNúria SoldevilaDiana ToledoPere GodoyElena EspejoMaria Amelia FernandezJosé María MayoralJesus CastillaMikel EgurrolaSonia TamamesJenaro AstrayMaría Morales-suárez-varelaThe Working Group Of The Project Pi/

subject

0301 basic medicineMaleEpidemiologyLaboratory-confirmed influenzaPreventing hospitalisationsUnited-statesmatched case–controlScreening method0302 clinical medicineInfluenza A Virus H1N1 SubtypeOutcome Assessment Health Care030212 general & internal medicineAged 80 and overVaccinationAucklandVaccinationHospitalizationImpactInfluenza VaccinesPopulation SurveillanceConditional logistic regressionFemalehospitalised cases hospitalised controlsSeasonsinfluenzaResearch Articlemedicine.medical_specialtyPopulation030106 microbiologyeffectivenesselderly03 medical and health sciencesNavarreNew-zealandVirologyInternal medicineInfluenza HumanmedicineHumansIn patientVaccine PotencyAgedbusiness.industryInfluenza A Virus H3N2 SubtypePublic Health Environmental and Occupational HealthCase-control studyInfluenza aConfidence intervalSurgeryInfluenza vaccinationLogistic ModelsSpainCase-Control StudiesElderly individualsbusiness

description

Influenza vaccination may limit the impact of influenza in the community. The aim of this study was to assess the effectiveness of influenza vaccination in preventing hospitalisation in individuals aged ≥ 65 years in Spain. A multicentre case–control study was conducted in 20 Spanish hospitals during 2013/14 and 2014/15. Patients aged ≥ 65 years who were hospitalised with laboratory-confirmed influenza were matched with controls according to sex, age and date of hospitalisation. Adjusted vaccine effectiveness (VE) was calculated by multivariate conditional logistic regression. A total of 728 cases and 1,826 matched controls were included in the study. Overall VE was 36% (95% confidence interval (CI): 22–47). VE was 51% (95% CI: 15–71) in patients without high-risk medical conditions and 30% (95% CI: 14–44) in patients with them. VE was 39% (95% CI: 20–53) in patients aged 65–79 years and 34% (95% CI: 11–51) in patients aged ≥ 80 years, and was greater against the influenza A(H1N1)pdm09 subtype than the A(H3N2) subtype. Influenza vaccination was effective in preventing hospitalisations of elderly individuals. This work was supported by the National Plan of I+D+I 2008–2011 and ISCIII-Subdirección General de Evaluación y Fomento de la Investigación (Project PI12/02079), and cofunded by Fondo Europeo de Desarrollo Regional (FEDER) and the Catalan Agency for the Management of Grants for University Research (AGAUR grant number 2014/ SGR 1403).

yearjournalcountryeditionlanguage
2017-08-24
10.2807/1560-7917.es.2017.22.34.30602https://hdl.handle.net/10668/11546