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The effectiveness of maternal pertussis vaccination in protecting newborn infants in Brazil: A case-control study

2019; Elsevier BV; Volume: 37; Issue: 36 Linguagem: Inglês

10.1016/j.vaccine.2019.03.049

1873-2518

Eder Gatti Fernandes, Ana Paula Sayuri Sato, Lourdes R.A. Vaz-de-Lima, Marcela Rodrigues, Daniela Leite, Cyro Alves de Brito, Expedito José de Albuquerque Luna, Telma Regina Marques Pinto Carvalhanas, Maria Lígia Bacciote Nerger Ramos, Helena Keico Sato, Euclides Ayres de Castilho,

Virology and Viral Diseases

In 2014, the Brazilian Ministry of Health (MoH) recommended Tdap to pregnant women in response to a significant increase in the incidence of pertussis among infants. The present study assessed the effectiveness of maternal immunization in preventing pertussis in infants.An unmatched case-control study was undertaken in São Paulo State, Brazil from February 2015 to July 2016. Cases were infants aged <8 weeks at onset of pertussis reported to the Surveillance System and confirmed by real-time polymerase chain reaction or culture. Four to six healthy infants were selected as controls per case from birth certificates in the Information System on Live Births database. General characteristics and mother's vaccination status were compared between cases and controls. The vaccine effectiveness (VE) was calculated as 1 - odds ratio (OR). For the adjusted VE, the OR was calculated using logistic regression analysis.Forty-two cases and 248 controls were enrolled in the study. Mothers of 8 cases (19.1%) and 143 controls (57.4%) were vaccinated during pregnancy, resulting in an unadjusted VE of 82.6% (95% confidence interval [CI], 60.8-92.3%). The VE was unchanged after adjusting for maternal age and monthly household income.Maternal pertussis vaccination during pregnancy was effective in protecting infants aged <8 weeks from pertussis.