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This interim analysis of an ongoing retrospective cohort study uses data from 5 US health plans to assess safety of a bivalent prefusion F subunit–based respiratory syncytial virus (RSV) vaccine administered during pregnancy during the first full RSV season after US Food and Drug Administration approval (from September 22, 2023, through June 14, 2024).
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Michnick et al. (2026) studied this question.
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