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Immunizations and Pregnancy - Topic Overview

Your immunity protects both you and your fetus. After you have been immunized (vaccinated) against or infected by a virus or bacteria, your body develops an immunity to that infectious agent. Full immunity can protect you from future infection, either for a lifetime or a limited period. Partial immunity strengthens your body's ability to fight that infection.

Before you become pregnant, be sure to review your immunization history with your doctor. Depending on the virus or bacteria, having had an immunization in childhood may not guarantee that you now have full immunity. To help ensure a healthy pregnancy, make sure that you are immune to the following before conceiving:

Before pregnancy: Rubella, measles, mumps, chickenpox

Rubella, measles, mumps, and chickenpox can harm a growing fetus. They can cause birth defects, fetal death, or premature birth. Chickenpox can also be dangerous for you when you're pregnant.

If you don't know whether you're immune to rubella, measles, or chickenpox, talk to your doctor about a blood test for antibodies to that virus. If you aren't immune, have the vaccination before becoming pregnant. To allow time for your body to develop antibodies to the virus, keep using birth control for at least 4 weeks after the vaccination.1

Before or during pregnancy: Flu and whooping cough (pertussis)

Flu and whooping cough are dangerous diseases for newborns and young infants. The flu can also be dangerous for you when you're pregnant. Getting the flu and Tdap vaccines during pregnancy is considered safe for your fetus. And these vaccines protect both you and your newborn. The U.S. Centers for Disease Control and Prevention (CDC) recommends:

  • If you didn't get the yearly flu vaccine yet, get the flu shot before or during your pregnancy.2 This is especially important if you have a chronic health problem (including asthma). The intranasal vaccine contains live virus, so it is not used during pregnancy.
  • Get a tetanus, diphtheria, and pertussis (Tdap) shot before or during each pregnancy.1
  • People who expect to have close contact with your baby should also get the flu and Tdap shots if they haven't had them. It's best to get them at least 2 weeks before contact with your baby.
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