HealthWise KnowledgeBase
Combination Vaccine for Hepatitis A and B
How Well It Works
In clinical trials, 1 month after the last dose, 100% of people were immune to hepatitis A, while 99.7% were immune to hepatitis B.Reference 2 But in practice, immunity may not approach these levels. Hepatitis B vaccine usually does not provide immunity for more than 95% to 97% of people.
Immunity to the hepatitis B virus is thought to be lifelong. The hepatitis A vaccine is effective for at least 25 years in adults and 14 years in children.Reference 3
| By: | Reference Healthwise Staff | Last Revised: August 30, 2012 |
| Medical Review: | Reference E. Gregory Thompson, MD - Internal Medicine
Reference W. Thomas London, MD - Hepatology |
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