Question: how often do you need to renew hepatitis a vaccine?
Answer: Anti-HAV has been shown to persist for at least 20 years in most people receiving the 2-dose series as infants <2 years of age (20), those vaccinated with a 3-dose series as young children (aged 3–6 years) (21,22), and adults receiving the entire vaccine series during adulthood (23,24).