Up to 15 years. At least 20 years
Vaccination with the full, two-dose series of Hepatitis A vaccine is the best way to prevent HAV infection. Hepatitis A vaccine has been licensed in the United States for use in persons 12 months of age and older. All children at age 1 year (i.e., 12–23 months). Children who have not been vaccinated by age 2 can be vaccinated at subsequent visits. Children and adolescents ages 2–18 who live in states or communities where routine Hepatitis A vaccination has been implemented because of high disease incidence. A single dose of hepatitis A vaccine is usually given as primary vaccination and then a booster dose can be given 6-12 months after the first vaccination to prolong its effect. Ideally, the vaccination should be given 4 weeks before travel. A combined hepatitis A and hepatitis B vaccine is also available in Australia. It is given as a course of 3 doses of vaccine: one vaccination is given immediately, the second is given one month later, and the third is given 5 months after that. A Stacy Wiegman, PharmD, Pharmacy, answered. You can expect the hepatitis A vaccine to provide protection against infection for at least 20 years. If you cannot remember when you were last vaccinated, your doctor can help determine if you are still protected.  A vaccination for both hepatitis A and B can be given to those ages 18 and older; however, this vaccination is administered in three doses over six months. A hepatitis A vaccination consists of inactive virus; people 1 year old or older can receive the vaccine. It is highly effective. The first dose protects your body (for the short-term) in an estimated two to four weeks. 1 For healthy persons aged 12 months–40 years, single-antigen Hepatitis A vaccine at the age-appropriate dose is preferred to IG because of the vaccine’s advantages, including long-term protection and ease of administration, as well as the equivalent efficacy of vaccine to IG. All children at age 1 year (i.e., 12–23 months). Children who have not been vaccinated by age 2 can be vaccinated at subsequent visits. Children and adolescents ages 2–18 who live in states or communities where routine Hepatitis A vaccination has been implemented because of high disease incidence. 1 Understand that hepatitis B vaccination-induced protective antibodies can last for up to 15 years, but appear to fall off over time. 2  Patients who were vaccinated 10 to 15 years ago, especially those who were vaccinated as children, may not be adequately protected. 1 Patients who were vaccinated 10 to 15 years ago, especially those who were vaccinated as children, may not be adequately protected. 2  For patients with this history who are at moderate to high risk of hepatitis B infection consider quantitative hepatitis B antibody measurement to determine protective immunity. A. I took the Hep A vaccine and then six months later took a booster and it supposedly lasts for life. But you have to get the booster. I read that Hep B vaccine is similar. Here's some more info that I pulled out of an article: Both the vaccines for hepatitis A and the vaccines for hepatitis B are highly effective. In studies of the four vaccines used for hepatitis A, nearly 100% of all adults who receive one develop protective levels of antibodies within one month of receiving a single dose A booster dose, given six to 12 months after the first dose, will protect you for at least 20 years. The type of vaccine that is best for you will depend on your individual circumstances.  Hepatitis A vaccination is recommended for all children at age 1 year, for persons who are at increased risk for infection, for persons who are at increased risk for complications from Hepatitis A, and for any person wishing to obtain immunity. All children at age 1 year (i.e., 12–23 months). Children who have not been vaccinated by age 2 can be vaccinated at subsequent visits. Children and adolescents ages 2–18 who live in states or communities where routine Hepatitis A vaccination has been implemented because of high disease incidence.
http://www.cdc.gov/hepatitis/HAV/HAVfaq.htm http://www.mydr.com.au/travel-health/travel-vaccinations https://www.sharecare.com/health/vaccines-immunology/how-hepatitis-a-vaccine-last http://www.ehow.com/how-does_5230566_long-hepatitis-vaccine-last_.html http://www.cdc.gov/hepatitis/HAV/HAVfaq.htm http://www.adepalma.com/medpage/HowLongHepatitisBVaccineEffectiveCMETeachingBrief.htm http://answers.webmd.com/answers/5000584/how-long-do-hepatitis-vaccines-last http://www.nhs.uk/Conditions/Hepatitis-A/Pages/Vaccination.aspx http://www.cdc.gov/hepatitis/HAV/HAVfaq.htm
how long does a hep a vaccine last