An observational study in Healthy and Healthy Adult, sponsored by Thammasat University. Completed at 1 site in Thailand. Open to participants aged 18 Years and older, including healthy volunteers. Per ClinicalTrials.gov, last updated 2025-12-23.
Sponsored by Thammasat University · Observational
This study is a cross-sectional study. The study aims to determine the levels of immunity against hepatitis B virus and varicella-zoster virus in medical students.
This study is a cross-sectional study aimed at determining the levels of immunity against the hepatitis B virus and varicella virus in medical students. Additionally, it aims to compare the rate of increase in immunity levels before and after receiving the hepatitis B and varicella-zoster vaccines in medical students. Medical students aged 18 years or older are included in the study.
1,045 studies on the registry are indexed under Hepatitis B; 139 are open to participants now.
This study's enrollment of 401 is close to the median of 365 across 251 observational studies indexed under Hepatitis B.
Browse Hepatitis B studies →Thammasat University is the lead sponsor of 85 studies on the registry; 16 are open to participants now.
Counted across the registry records on this site, refreshed daily.
Medical students aged 18 years or older are included.
Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Exclusion Criteria:
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Hepatitis B is a virus that infects the liver. These are separate tests: HBsAg positive usually means a current infection (a recent vaccination can briefly cause it too); total anti-HBc (HBcAb) positive means an infection now or in the past; HBV DNA measures how much virus is in the blood.
Some studies accept a past infection if HBV DNA is undetectable, sometimes with antiviral medicine during the study. Check what this study allows.
Hepatitis B tests
Hepatitis B is a virus that infects the liver. These are separate tests: HBsAg positive usually means a current infection (a recent vaccination can briefly cause it too); total anti-HBc (HBcAb) positive means an infection now or in the past; HBV DNA measures how much virus is in the blood.
Some studies accept a past infection if HBV DNA is undetectable, sometimes with antiviral medicine during the study. Check what this study allows.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Medical students aged 18 years or older
The seroprevalence of hepatitis B virus
The immunity level against the hepatitis B virus is assessed.
Time frame: From enrollment to the end of treatment at 6 months
The seroprevalence of varicella-zoster virus
The immunity level against varicella-zoster virus is assessed.
Time frame: From enrollment to the end of treatment at 6 months
The vaccination rate of hepatitis B virus
The vaccination rate of hepatitis B virus is assessed.
Time frame: From enrollment to the end of treatment at 6 months
The vaccination rate of varicella-zoster virus
The vaccination rate of varicella-zoster virus is assessed.
Time frame: From enrollment to the end of treatment at 6 months
Plan to share: Yes — IPD and documents will be available for sharing immediately after publication for a period of 2 years.
Supporting information: Study protocol, Statistical analysis plan, Clinical study report
Time frame: IPD and documents will be available for sharing immediately after publication for a period of 2 years.
Access criteria: All researchers will be able to access the IPD and supporting information via the repository website without restriction.
This study is completed, as verified in Apr 2025. You cannot join it, but the record below documents what was studied.
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Thammasat University