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British Medical JournalMaternal mRNA COVID-19 Vaccination During Pregnancy and Delta or Omicron Infection or Hospital Admission in Infants: Test Negative Design Study

Maternal immunization with 2 doses of vaccine was 97% and 53% effective against infant hospitalization from delta and omicron variants, respectively. The effectiveness of the vaccine in preventing infant hospitalization declined by nearly 20% after 16 weeks. Receiving the second dose in the third trimester yielded the greatest benefit.

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