At what age intervals should the second dose of the Hep A vaccine be administered?

The second dose of the Hepatitis A vaccine should be administered within the interval of 6 to 12 months after the first dose, which is typically given to children in the range of 12 to 23 months of age. Therefore, administering the second dose between 12 and 24 months aligns with the recommended vaccination schedule for Hepatitis A, allowing the immune system adequate time to respond to the initial vaccination while ensuring full protection before entering potential exposure environments, such as childcare or school settings. This timing is particularly important because the vaccination series is considered most effective when both doses are completed at the appropriate intervals.

The other age intervals provided do not align with the established guidelines for the Hepatitis A vaccination schedule, making them unsuitable for the timing of the second dose.