Hep B vaccine schedule: how many injections by what age?

Hep B vaccine schedule: how many injections by what age?

• A. Three injections by 6-18 months
• B. Two injections by 12 months
• C. One injection at birth
• D. Four injections by 5 years

Answer: (A)

The main idea is that the hepatitis B vaccine for infants is a three-dose series that should be completed by 6 to 18 months of age. The usual schedule starts with a dose at birth, then a second dose around 1–2 months, and a third dose at 6–18 months. Completing all three doses by 18 months provides full primary protection against hepatitis B. Having only two doses by 12 months wouldn’t give complete protection, and a single birth dose doesn’t confer long-term immunity. Four injections by 5 years goes beyond the standard infant schedule.

The main idea is that the hepatitis B vaccine for infants is a three-dose series that should be completed by 6 to 18 months of age. The usual schedule starts with a dose at birth, then a second dose around 1–2 months, and a third dose at 6–18 months. Completing all three doses by 18 months provides full primary protection against hepatitis B. Having only two doses by 12 months wouldn’t give complete protection, and a single birth dose doesn’t confer long-term immunity. Four injections by 5 years goes beyond the standard infant schedule.