I just got the RSV vaccine. How long do I need to wait before I get pregnant?
The Abrysvo® RSV vaccine is only recommended for individuals who are already pregnant (32-36 weeks) and for older adults. In the rare event that someone gets the RSV vaccine and is planning a pregnancy, there is no recommendation to wait to get pregnant.
Does getting the RSV vaccine increase the chance of miscarriage?
Miscarriage is common and can occur in any pregnancy for many different reasons. Studies have not been done to see if the RSV vaccine increases the chance for miscarriage. The RSV vaccine is recommended for use during the third trimester of pregnancy, which is past the time when a miscarriage can happen.
Does getting the RSV vaccine increase the chance of birth defects?
Birth defects can happen in any pregnancy for different reasons. Out of all babies born each year, about 3 out of 100 (3%) will have a birth defect. We look at research studies to try to understand if an exposure, like the RSV vaccine, might increase the chance of birth defects in a pregnancy. Studies on individuals who received the Abrysvo® RSV vaccine during pregnancy have not found a higher chance of birth defects.
Does getting the RSV vaccine in pregnancy increase the chance of other pregnancy-related problems?
A clinical trial looking at over 3,600 individuals who received the Abrysvo® RSV vaccine between 24 and 36 weeks of pregnancy found no increased chance of pregnancy-related problems, such as low birth weight (weighing less than 5 pounds, 8 ounces [2500 grams] at birth). However, slightly more preterm deliveries were seen in those who received the vaccine. In most cases, the preterm deliveries happened a month or more after getting the vaccine. A newer study looking at over 2,900 pregnant individuals who received the Abrysvo® RSV vaccine did not find an increased chance of preterm delivery. The recommendation to get the vaccine closer to the end of pregnancy (at 32-36 weeks) allows time for antibodies to pass to the baby before delivery but lowers the chance (if there is one) of delivering early from the vaccine, since the vaccine is given closer to full term.
Does getting the RSV vaccine in pregnancy affect future behavior or learning for the child?
Studies have not been done to see if getting the RSV vaccine can cause behavior or learning issues for the child.
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