Question: what is difference between dtap and tdap?
Answer: DTaP is approved for children under age 7. Tdap, which has a reduced dose of the diphtheria and pertussis vaccines, is approved for adolescents starting at age 11 and adults ages 19 to 64. It is often called a booster dose because it boosts the immunity that wanes from vaccines given at ages 4 to 6.