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- W2044201006 abstract "Limited specificity of the tuberculin skin test incited the development of in vitro assays based on Mycobacterium tuberculosis-specific antigens such as ESAT-6 that are lacking in Bacillus Calmette Guérin (BCG). In animal studies, intradermal ESAT-6 was safe and induced specific skin test responses. The aim of the study was to assess the safety of intradermal recombinant dimer ESAT-6 (rdESAT-6) compared with tuberculin and to determine the human dose. The study design was a double-blind Phase I study with intra-subject randomization to the left and right forearm, comparing 2 Tuberculin Units (TU) intradermal tuberculin (RT23) with 0.01, 0.1, 1 or 10 μg rdESAT-6 in groups of five healthy controls or treated tuberculosis (TB) patients. The risk of sensitization after skin testing was assessed in healthy volunteers. All doses were tolerated well by healthy volunteers and responses to rdESAT-6 were limited to transient redness after 24 h only at the highest dose. No sensitization was observed. Because 1 μg rdESAT-6 induced large responses with local side effects in some TB patients, the 10 μg dose of rdESAT-6 was not tested. Mean responses to 0.01, 0.1 and 1 μg rdESAT-6 measured 14.0, 19.8 and 38.8 mm of redness, respectively, and 7.0, 13.4 and 14.6 mm of induration. The response to tuberculin was similar to the responses to 0.1 μg rdESAT-6. Mild local side effects due to tuberculin and rdESAT-6 were observed in 8/15, respectively, 6/15 patients, more pronounced at the highest rdESAT-6 dose. In conclusion, this pilot Phase I study of safety, feasibility and dose finding of intradermal rdESAT-6 provides proof of principle of a specific skin test for human use. No serious adverse events were observed but the study was not sufficiently powered to demonstrate complete safety. Intradermal rdESAT-6 did not seem to sensitize healthy volunteers. In treated TB patients, responses to rdESAT-6 were optimal at 0.1 μg. Further studies are needed to evaluate sensitization after repeated doses and to study the effect of additional CFP-10 on the sensitivity of a TB-specific skin test." @default.
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- W2044201006 date "2008-05-01" @default.
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- W2044201006 title "Double-blind randomized Phase I study comparing rdESAT-6 to tuberculin as skin test reagent in the diagnosis of tuberculosis infection" @default.
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- W2044201006 doi "https://doi.org/10.1016/j.tube.2007.11.004" @default.
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