New TB skin test could spare rheumatoid patients from hidden infection
NCT ID NCT06796647
First seen Jun 26, 2026 · Last updated Jun 26, 2026
Summary
This study tests a new skin test (C-TST) to find hidden tuberculosis (TB) infection in people with rheumatic diseases like rheumatoid arthritis who are about to start powerful medications called biologics. These drugs can reactivate dormant TB, so accurate screening is critical. Researchers will compare the new test with standard skin and blood tests in 100 adults, then follow them for two years to see who develops active TB.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- Active substance
- ESAT6/CFP10 skin test (C-TST)
- What this could lead to
- If successful, this could provide a more accurate and convenient way to detect hidden TB infection in people with rheumatic diseases, helping prevent active TB when they start certain medications.
- What could go wrong
- This is a small, early-stage study with only 100 participants. The new test may not prove more accurate than existing methods, and results may not apply to all patient groups.
This is an AI summary of the original study and may miss details. Read our disclaimer.
Study facts
What this study's own registry entry says, in plain language.
- Participants
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About 100 people
The number the study aims to enrol. It can still change while the study runs.
- Started
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Mar 2025
- Expected to finish
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Aug 2028
An estimate. End dates often move.
- Lead sponsor
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Other sponsor
The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
Who is studied
Rheumatology patients followed up at the Specialist Services of regional hospitals in New Territories East Cluster in Hong Kong (Prince of Wales Hospital, Alice Ho Miu Ling Nethersole Hospital and North District Hospital)
- Ages
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18 to 65 years
- Sex
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Anyone
- Healthy volunteers
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Not accepted
This study is not open to healthy volunteers. The entry requirements below say who it is open to.
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Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
Inclusion Criteria: 1. adult of age ≥ 18 and up to 65 years; 2. diagnosis of at least one classified rheumatologic disease; and 3. being planned to receive b/tsDMARDs therapy, 4. can communicate in Chinese and/or English. Exclusion Criteria: * diagnosis of active TB diseases, * currently receiving TB or LTBI treatment; * concurrent mental illnesses; * prisoners.
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Conditions
The condition(s) this trial relates to.
As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
How to take part
Only the study team decides who joins. These are the ways to reach them.
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The places running it
2 sites in 2 countries. The list below names each one and where it is.
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The official record
ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.
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A doctor treating you
A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.
Contacts and locations
Locations
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S.H. Ho Research Centre for Infectious Diseases
RECRUITINGHong Kong, Hong Kong, 0000, China
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S.H. Ho Research Centre for Infectious Diseases
NOT_YET_RECRUITINGShatin, Hong Kong, 0000, Hong Kong
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