It is possible for a pregnant woman to be infected with chickenpox, but this depends on the circumstances. If a pregnant woman has had chickenpox once before pregnancy and the corresponding immunity can be maintained for life, she will not get chickenpox again during pregnancy. If a pregnant woman has had a chickenpox vaccination, it is likely that this immunity will last during pregnancy, and the likelihood of getting chickenpox in this case is greatly reduced. The main reason why pregnant women get chicken pox is because they do not have the appropriate immunity during pregnancy. When a pregnant woman gets chicken pox, the corresponding symptoms may be heavier, because pregnant women are adults, and adults have heavier symptoms than children. In addition, also because pregnant women are in a special physiological state, after getting chickenpox the symptoms are heavier than those of ordinary adults. Chickenpox in pregnant women may affect the child, but it is less likely to cause malformations in the child compared to viral infections such as rubella and cytomegalic. The probability of causing congenital chickenpox syndrome in a child after a pregnant woman has chickenpox within 20 weeks is only 2%.