Long-term immunity after hepatitis A vaccine
Part of Digestive system, Infections clinical trials.
This study checks how long the protection from a hepatitis A vaccine lasts in healthy people who got the full vaccine series years ago. It involves a blood test to measure immunity, which can help confirm if a booster is needed.
Summary written for real people, not researchers, by Clin2.
Who can take part
- You are between 21 and 28 years old.
- You took part in a previous Sinovac hepatitis A vaccine study and finished all doses.
- You are generally healthy.
- You have not had hepatitis A infection.
- You have not received any other hepatitis A vaccine since the earlier study.
- You are willing to give a blood sample for testing.
Quick eligibility check
Answer a few plain-language questions, based on this study's own requirements, to get a preliminary sense of fit.
Similar studies
Other trials that look related to this one.
This study checks if antibodies from earlier childhood vaccines (IPV, MMR, and hepatitis A) remain in the body five years later. It aims to understand how long protection may last.
This study is looking at how the immune system responds in children with acute hepatitis A (a liver infection). Participation may help doctors better understand the body's natural defenses and improve care for other children.
This trial tests a new hepatitis A vaccine in healthy people aged 1 year and older. It aims to see how well the vaccine prevents hepatitis A and checks for any side effects.
This study checks whether a single dose of the hepatitis A vaccine helps protect people with cirrhosis who have no immunity. It aims to see how well the vaccine works and your body's response.
This early-phase study tests whether a hepatitis B vaccine (with an added ingredient to boost the immune response) can safely help people with long-term hepatitis B who are already on antiviral therapy. It is mainly looking at safety and how the immune system responds.
This study looks at how your body's cells respond after getting a hepatitis B vaccine. It may help researchers understand how well the vaccine works.
Hear when a new Hepatitis A trial opens
We’ll email you when one opens — at most once a week, no account needed, unsubscribe anytime.