Successful Memory Response following a Booster Dose with a Virosome-Formulated Hepatitis A Vaccine Delayed Up to 11 Years

Boosting adult travelers with the virosome-formulated, aluminum-free hepatitis A vaccine Epaxal up to 128 months after a single primary dose confers full protection against hepatitis A, even in travelers aged 50 years and above. Delaying the booster dose did not influence the immune memory response to Epaxal.