Persistence of Hepatitis A Antibody in Healthy Adults ~32 Years Post Vaccination.

Summary

The goal of this clinical trial is to evaluate the persistence of Hepatitis A antibody \~32 years post vaccination in healthy adults. The questions this study will answer are: 1) how long antibody persists and 2) The immune response to an additional dose of vaccine among those with no detectable antibody. Participants will be asked to provide a blood specimen. Those with no detectable antibody will be offered an additional dose of vaccine. The kinetics of antibody response in this population will be summarized.

Timeline

Start

2024-01

Primary completion

2025-03

Completion

2025-06

Drugs

Indications