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Avrich Ciesla A, Lazariu V, Dascomb K, Irving SA, Dixon BE, Gaglani M, Naleway AL, Grannis SJ, Ball S, Kharbanda AB, Vazquez-Benitez G, Klein NP, Natarajan K, Ong TC, Embi PJ, Fleming-Dutra KE, Link-Gelles R, Zerbo O. Effectiveness of the Original Monovalent and Bivalent COVID-19 Vaccines Against COVID-19-Associated Emergency Department and Urgent Care Encounters in Pregnant Persons Who Were Not Immunocompromised: VISION Network, June 2022-August 2023. Open forum infectious diseases. 2024 Sep 1; 11(9):ofae481.
Pregnant people face increased risk of severe COVID-19. Current guidelines recommend updated COVID-19 vaccination (2023-2024) for those aged = 6 months, irrespective of pregnancy status. To refine recommendations for pregnant people, further data are needed. Using a test-negative design, we evaluated COVID-19 vaccine effectiveness against medically attended COVID-19 with COVID-19-like illness among pregnant people aged 18 to 45 years during June 2022 to August 2023. When doses were received during pregnancy, vaccine effectiveness was 52% (95% CI, 29%-67%); when received < 6 months prior to pregnancy, 28% (95% CI, 11%-42%); and when received = 6 months prior to pregnancy, 6% (95% CI, -11% to 21%). Pregnant people should stay up-to-date with recommended COVID-19 vaccination.