| American College of Obstetricians and Gynecologists | Prevention and control of seasonal influenza with vaccines: Recommendations of the Advisory Committee on Immunization Practices — United States, 2020-21 influenza season |
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| Centers for Disease Control and Prevention | Centers for Disease Control and Prevention |
| Prevention and control of seasonal influenza with vaccines: Recommendations of the Advisory Committee on Immunization Practices — United States, 2020-21 influenza season | |
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| Vaccine effectiveness — How well does the flu vaccine work? Influenza in infants born to women vaccinated during pregnancy | Frequently asked influenza flu questions: 2020-2021 season |
| Vaccine effectiveness — How well does the flu vaccine work? American College of Obstetricians and Gynecologists | |
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