Article ; Online: Randomised clinical trial investigating the specificity of a novel skin test (C-Tb) for diagnosis of M. tuberculosis infection.
PloS one
2013 Volume 8, Issue 5, Page(s) e64215
Abstract: ... of recombinant ESAT-6 and CFP-10 (C-Tb) produced in Lactococcus lactis for diagnosis of M. tuberculosis infection ... Methods: In a dose finding phase I trial 0.01 or 0.1 µg preserved and unpreserved C-Tb was injected ... specificity trial in 151 uninfected, BCG vaccinated participants 0.1 µg C-Tb was compared to 2 TU PPD ...
Abstract | Background: Tuberculin skin testing is simple and relatively inexpensive, but the specificity of PPD is affected by BCG vaccination. Objective: Determine optimal dose and specificity of recombinant ESAT-6 and CFP-10 (C-Tb) produced in Lactococcus lactis for diagnosis of M. tuberculosis infection. Methods: In a dose finding phase I trial 0.01 or 0.1 µg preserved and unpreserved C-Tb was injected by Mantoux technique in 38 patients with active tuberculosis and induration responses measured. In a phase II specificity trial in 151 uninfected, BCG vaccinated participants 0.1 µg C-Tb was compared to 2 TU PPD. Results: 0.1 µg C-Tb gave a median induration of 15 mm after 2 days. Phenol preservation did not affect the response. The specificity of C-Tb was 99.3% (95% CI 96-100%) regarding indurations ≥5 mm as a positive outcome. This was higher than the specificity of PPD (63% using a cut-off of 5 mm or 92% using a cut-off of 15 mm to adjust for non-specific BCG responses). Local adverse reactions following C-Tb injection included transient itching and discomfort as expected components of the immune response. Conclusion: C-Tb offers a simple and convenient skin test to diagnose M. tuberculosis infection using a single, universal cut-off unaffected by BCG vaccination. Trial registration: ClinicalTrials.gov NCT01033929 and NCT01241188. |
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MeSH term(s) | Adolescent ; Adult ; Antigens, Bacterial/adverse effects ; Antigens, Bacterial/chemistry ; Antigens, Bacterial/immunology ; Bacterial Proteins/adverse effects ; Bacterial Proteins/chemistry ; Bacterial Proteins/immunology ; Dose-Response Relationship, Immunologic ; Female ; Humans ; Male ; Middle Aged ; Mycobacterium bovis/immunology ; Mycobacterium tuberculosis/immunology ; Mycobacterium tuberculosis/physiology ; Phenol/chemistry ; Sensitivity and Specificity ; Tuberculin Test/adverse effects ; Tuberculin Test/methods ; Tuberculosis/diagnosis ; Tuberculosis/immunology ; Vaccination ; Young Adult |
Chemical Substances | Antigens, Bacterial ; Bacterial Proteins ; CFP-10 protein, Mycobacterium tuberculosis ; ESAT-6 protein, Mycobacterium tuberculosis ; Phenol (339NCG44TV) |
Language | English |
Publishing date | 2013-05-14 |
Publishing country | United States |
Document type | Clinical Trial, Phase I ; Clinical Trial, Phase II ; Journal Article ; Randomized Controlled Trial ; Research Support, Non-U.S. Gov't |
ISSN | 1932-6203 |
ISSN (online) | 1932-6203 |
DOI | 10.1371/journal.pone.0064215 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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