with nearly all subjects developing hepatitis A antibodies (anti-HAV) within 2 weeks. [3] However, a second dose of vaccine, given 6 or 12 to 18 months after the first dose in accordance with the ...

Among the many lingering questions about the coronavirus, one of the most crucial is: How long do antibodies last? With some diseases, like measles and hepatitis A, infection is a one-and-done deal.