Vaccine Information 2025
Content added June 25, 2025
Different vaccines work in different ways, but every vaccine helps the body’s immune system learn how to fight germs. It typically takes a few weeks for protection to develop after vaccination, but that protection can last a lifetime. A few vaccines, such as those for tetanus or seasonal flu, require occasional booster doses to maintain the body’s defenses. Immunity is the body’s way of preventing disease. Vaccines can prevent common diseases that used to seriously harm or even kill infants, children, and adults. Without vaccines, your child is at risk of becoming seriously ill or even dying from childhood diseases such as measles and whooping cough.