Indirect protection and long-term effectiveness of inactivated COVID-19 vaccine: a stepped-wedge randomised trial in Serrana, Brazil.

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Title: Indirect protection and long-term effectiveness of inactivated COVID-19 vaccine: a stepped-wedge randomised trial in Serrana, Brazil.
Authors: Borges MC; Ribeirão Preto Medical School, University of São Paulo, São Paulo, SP, Brazil. marcosborges@fmrp.usp.br.; Clinical Research Center - S, São Paulo, SP, Brazil. marcosborges@fmrp.usp.br., Palacios R; Instituto Butantan, São Paulo, SP, Brazil., Conde MTRP; Instituto Butantan, São Paulo, SP, Brazil., Volpe GJ; Clinical Research Center - S, São Paulo, SP, Brazil., Ferreira NN; Clinical Research Center - S, São Paulo, SP, Brazil., Garibaldi PMM; Clinical Research Center - S, São Paulo, SP, Brazil., Fonseca BAL; Ribeirão Preto Medical School, University of São Paulo, São Paulo, SP, Brazil., Calado RT; Ribeirão Preto Medical School, University of São Paulo, São Paulo, SP, Brazil., Coutinho BM; Clinical Research Center - S, São Paulo, SP, Brazil., Gomes BBM; Clinical Research Center - S, São Paulo, SP, Brazil., de Lima Dias CFS; Clinical Research Center - S, São Paulo, SP, Brazil., de Moraes GR; Health Department, Serrana, SP, Brazil., Haddad SK; Ribeirão Preto Medical School, University of São Paulo, São Paulo, SP, Brazil., de Miranda EJFP; Instituto Butantan, São Paulo, SP, Brazil., Braga PE; Instituto Butantan, São Paulo, SP, Brazil., Ragiotto L; Instituto Butantan, São Paulo, SP, Brazil., França JID; Instituto Butantan, São Paulo, SP, Brazil., de Lima MA; Instituto Butantan, São Paulo, SP, Brazil., de Oliveira Alves LB; Instituto Butantan, São Paulo, SP, Brazil., de Camargo Vieira Tenorio J; Instituto Butantan, São Paulo, SP, Brazil., Sampaio SC; Instituto Butantan, São Paulo, SP, Brazil., Covas DT; Ribeirão Preto Medical School, University of São Paulo, São Paulo, SP, Brazil.; Instituto Butantan, São Paulo, SP, Brazil., Dos Santos Almeida MAAL; Instituto Butantan, São Paulo, SP, Brazil., Morandi Junior E; Instituto Butantan, São Paulo, SP, Brazil., Boulos FC; Instituto Butantan, São Paulo, SP, Brazil.
Source: Scientific reports [Sci Rep] 2026 Feb 19; Vol. 16 (1). Date of Electronic Publication: 2026 Feb 19.
Publication Type: Journal Article; Randomized Controlled Trial
Journal Info: Publisher: Nature Publishing Group Country of Publication: England NLM ID: 101563288 Publication Model: Electronic Cited Medium: Internet ISSN: 2045-2322 (Electronic) Linking ISSN: 20452322 NLM ISO Abbreviation: Sci Rep Subsets: MEDLINE
Database: MEDLINE Ultimate
Description
ISSN:2045-2322
DOI:10.1038/s41598-026-37815-1