Monge, SusanaOlmedo, CarmenAlejos, BelénLapeña, María FéSierra, María JoséLimia, AuroraCOVID-19 Registries Study Group2Mazagatos, ClaraLarrauri, Amparo2023-02-072023-02-072021-10Emerg Infect Dis. 2021 Oct;27(10):2595-2603.http://hdl.handle.net/20.500.12105/15459We conducted a registries-based cohort study of long-term care facility residents >65 years of age offered vaccination against severe acute respiratory syndrome coronavirus 2 before March 10, 2021, in Spain. Risk for infection in vaccinated and nonvaccinated persons was compared with risk in the same persons in a period before the vaccination campaign, adjusted by daily-varying incidence and reproduction number. We selected 299,209 persons; 99.0% had >1 dose, 92.6% had 2 doses, and 99.8% of vaccines were Pfizer/BioNTech (BNT162b2). For vaccinated persons with no previous infection, vaccine effectiveness was 81.8% (95% CI 81.0%-82.7%), and 11.6 (95% CI 11.3-11.9) cases were prevented per 10,000 vaccinated/day. In those with previous infection, effectiveness was 56.8% (95% CI 47.1%-67.7%). In nonvaccinated residents with no previous infection, risk decreased by up to 81.4% (95% CI 73.3%-90.3%). Our results confirm vaccine effectiveness in this population and suggest indirect protection in nonvaccinated persons.engVoRCOVID-19SARS-CoV-2SpainCoronavirus diseaseElderlyIndirect effectsLong-term care facilitiesRespiratory infectionsSevere acute respiratory syndrome coronavirus 2TransmissibilityVaccinationVaccine effectivenessVirusesZoonosesCOVID-19SARS-CoV-2BNT162 VaccineCOVID-19 VaccinesCohort StudiesHumansLong-Term CareRNA, MessengerSpainVaccinationAtribución 4.0 Internacional3431467027102595-260310.3201/eid2710.2111841080-6059Emerging infectious diseasesopen access