评论：顾问委员会与美国妇产科医师学院建议所有孕妇接受每年一次的流感疫苗接种。
Comment: Both the Advisory Committee on Immunization Practices and the American College of Obstetricians and Gynecologists recommend annual influenza vaccination for all pregnant women.
评论：顾问委员会与美国妇产科医师学院建议所有孕妇接受每年一次的流感疫苗接种。
Comment: Both the Advisory Committee on Immunization Practices and the American College of Obstetricians and Gynecologists recommend annual influenza vaccination for all pregnant women.
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