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Protection conferred by vaccine plus previous infection (hybrid immunity) with vaccines of three different platforms during the Omicron variant period in Brazil
Thiago Cerqueira-Silva; Vinicius de Araújo Oliveira; Enny S. Paixão; Pilar Florentino; Gerson O. Penna; Neil Pearce; Guilherme L. Werneck; Maurício L. Barreto; Viviane S. Boaventura; Manoel Barral-Netto.
Afiliación
  • Thiago Cerqueira-Silva; Faculdade de Medicina - Universidade Federal da Bahia
  • Vinicius de Araújo Oliveira; Center of Data and Knowledge Integration for Health (CIDACS), Instituto Gonçalo Moniz, Fiocruz, Salvador, Bahia, Brazil
  • Enny S. Paixão; London School of Hygiene and Tropical Medicine, London WC1E 7HT, UK
  • Pilar Florentino; Instituto de Ciências Biomédicas, Universidade de São Paulo, São Paulo, Brazil
  • Gerson O. Penna; Nuúcleo de Medicina Tropical, Universidade de Brasiília. Escola Fiocruz de Governo, Fiocruz, DF, Brazil
  • Neil Pearce; London School of Hygiene and Tropical Medicine, London WC1E 7HT, UK
  • Guilherme L. Werneck; Universidade Federal do Rio de Janeiro, Rio de Janeiro,Brazil
  • Maurício L. Barreto; Instituto de Saúde Coletiva - Universidade Federal da Bahia
  • Viviane S. Boaventura; Faculdade de Medicina - Universidade Federal da Bahia
  • Manoel Barral-Netto; Faculdade de Medicina - Universidade Federal da Bahia
Preprint en En | PREPRINT-MEDRXIV | ID: ppmedrxiv-22273752
ABSTRACT
Hybrid immunity (infection plus vaccination) provided high protection against infection and severe disease in the periods of delta and gamma variants of concern. However, the protection of hybrid immunity in the Omicron era remains unknown. We performed a test-negative study using Brazilian national databases between January 01 and March 22, 2022, a period of predominant circulation of the Omicron variant in Brazil. Hybrid immunity offered low protection against infection, with rapid waning, compared to unvaccinated with or without previous infection. For severe illness (hospitalisation or death), the protection, although already high for unvaccinated pre-infected increased regardless of the type of vaccine (Ad26.COV2.S, BNT162b2, ChAdOx-1 or CoronaVac). In conclusion, during the Omicron-dominant period in Brazil, hybrid immunity offered high protection against severe illness and low protection against infection.
Licencia
cc_by_nc_nd
Texto completo: 1 Colección: 09-preprints Base de datos: PREPRINT-MEDRXIV Idioma: En Año: 2022 Tipo del documento: Preprint
Texto completo: 1 Colección: 09-preprints Base de datos: PREPRINT-MEDRXIV Idioma: En Año: 2022 Tipo del documento: Preprint