Tdap (tetanus toxoid, reduced diphtheria toxoid, and acellular pertussis) is a vaccine that protects against three serious diseases:
All pregnant women should get the Tdap vaccine during each pregnancy. The vaccine helps your body make antibodies to protect you from disease. These antibodies pass to your fetus and can protect your newborn until he or she can get the Tdap vaccine at 2 months old.
Tdap during pregnancy provides the best protection for mother and infant. Optimal timing is between 27 and 36 weeks gestation (preferably during the earlier part of this period) to maximize the maternal antibody response and passive antibody transfer to the infant.
Pregnant women should receive Tdap anytime during pregnancy if it is indicated for wound care or during a community pertussis outbreak.
If Tdap is administered earlier in pregnancy, it should not be repeated between 27 and 36 weeks gestation.