Answer:
For the hepatitis B vaccine:
For long-lasting immunity, you need three to four doses, depending on which type of vaccine is used. You get them as shots. Children should get their first dose at birth and complete the series by age 6 months
Explanation:
Routine administration schedule for hepatitis B vaccine in adults. The dosing schedule is 0, 1 to 2 months, and 4 to 6 months. There is some flexibility in the schedule, but be sure to keep in mind the minimum intervals between doses: At least four weeks between doses #1 and #2.
How long does protection from hepatitis B vaccine last? Studies indicate that immunologic memory remains intact for at least 30 years among healthy people who initiated hepatitis B vaccination at >6 months of age (16).
