AI Article Synopsis
- A cohort study in Spain examined COVID-19 vaccination effectiveness among long-term care residents over 65 years old before March 10, 2021.
- Out of 299,209 participants, 99% received at least one dose, mainly the Pfizer/BioNTech vaccine, showing 81.8% effectiveness in those without prior infections.
- The study also indicated that nonvaccinated individuals experienced a risk reduction of up to 81.4%, pointing to indirect protection from the vaccinations in this population.
Article Abstract
We 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.
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Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8462307 | PMC |
| http://dx.doi.org/10.3201/eid2710.211184 | DOI Listing |
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