Maternal vaccination against influenza associated with protection for infants

How long does the protection from a mother’s immunization against influenza during pregnancy last for infants after they are born? A new study indicates that the vaccine’s efficacy against influenza illness was highest when infants were 8 weeks or younger at 85.6 percent but decreased as the infants grew to 25.5 percent among infants 8 to 16 weeks and to 30.3 percent among infants 16 to 24 weeks.