In pregnant women, the likelihood of influenza to be severe is higher than the non-pregnant women of the same age group.
Some changes in the immune system, the circulatory system and the respiratory system during pregnancy, which can linger up to 2 weeks after labor, may lead to severe influenza and even hospitalization. Influenza can be harmful to the development of the fetus, mainly because it causes fever. Therefore, inactivated flu shot which provides protection against influenza is important for the health of both the pregnant woman and the fetus. The protective antibodies formed in the body through the vaccination of the pregnant woman will also pass through the blood to the fetus; therefore, it will provide protection for the baby for several months after birth.