What vaccines require repeated doses?

The routine vaccinations that need boosters include but are not limited to MMR, Varicella (chickenpox), HPV, tetanus, and influenza. Recommended adult boosters in the USA include Tdap, which is administered every ten years. The CDC and the ACIP recommend that one dose of the Tdap vaccine is administered to women during each pregnancy irrespective of prior vaccination.

The dosing of Tdap in pregnant women protects infants from pertussis in the first two months of life when they are vulnerable to whooping cough, which is a disease that can be fatal to newborns. The flu is a shot that is given once a year around the cold and flu season. The shingles are something that affects adults, and one dose is given at age 60. Adults who do not have immunity to varicella receive two doses of single-antigen varicella vaccine. Boosters can protect people from the diseases that threaten our society, and they are given to people more than once in a lifetime.