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. 2024 Dec 22;12(12):1445.
doi: 10.3390/vaccines12121445.

The Benefits of COVID-19 Vaccination for Pregnant Patients Hospitalized with Respiratory Symptoms: A Retrospective Cohort Study in South Brazil

Christopher J Hernandez  1 , Kavya G Sundar  2 , Fernando Echegaray  1 , Mary Catherine Cambou  3 , Lanbo Z Yang  4 , Eddy R Segura  5 , Marineide Gonçalves de Melo  6 , Breno Riegel Santos  6 , Ivana Rosângela Dos Santos Varella  6 , Karin Nielsen-Saines  7
Affiliations

The Benefits of COVID-19 Vaccination for Pregnant Patients Hospitalized with Respiratory Symptoms: A Retrospective Cohort Study in South Brazil

Christopher J Hernandez et al. Vaccines (Basel). .

Abstract

Objectives: SARS-CoV-2 infection is a known risk factor for adverse health outcomes in pregnancy, affecting both maternal and neonatal health. Mounting evidence suggests that even a single dose of an approved COVID-19 vaccine protects against severe SARS-CoV-2 infection and is safe for both pregnant persons and neonates. Southern Brazil was heavily affected by the COVID-19 pandemic, and the protective effects of the vaccine on maternal and neonatal health are not well described. This study aims to examine the protective effects of maternal COVID-19 vaccination on both maternal and neonatal outcomes following SARS-CoV-2 infection during pregnancy.

Methods: This is a retrospective cohort study that leveraged medical data from a tertiary center in South Brazil to compare maternal and infant outcomes between hospitalized pregnant persons with and without SARS-CoV-2 infection between 1 March 2020, and 1 March 2023.

Results: In total, 524 patients were enrolled, including 275 pregnant patients with confirmed SARS-CoV-2 infection and 249 without infection. SARS-CoV-2 infection was associated with maternal ventilator support (adjusted Risk Ratio [aRR] = 1.48, 95% Confidence Interval [95% CI]: 1.08-2.03), while receipt of at least one dose of COVID-19 vaccine was associated with protection against maternal sepsis (aRR = 0.14, 95% CI: 0.03-0.56), intensive care unit (ICU) admission (aRR = 0.27, 95% CI: 0.10-0.68), need for ventilator support (aRR = 0.60, 95% CI: 0.43-0.84), infant admission to the neonatal intensive care unit (NICU) (aRR = 0.62, 95% CI: 0.47-0.82), and neonatal respiratory distress (aRR = 0.60, 95% CI: 0.43-0.83).

Conclusions: These findings further underscore the importance of maternal vaccination against COVID-19 during pregnancy. Even one dose of vaccine was protective against a variety of maternal and neonatal outcomes. Prenatal care should encourage COVID-19 vaccination in pregnancy.

Keywords: COVID-19; SARS-CoV-2; pregnancy outcomes; vaccination.

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Conflict of interest statement

All authors deny any conflicts of interest.

Figures

Figure 1
Figure 1
Patient selection cascade among SARS-CoV-2 positive and negative pregnant patients.
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