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A positive reaction suggests TB infection (latent or active), while a negative reaction generally rules out TB infection in immunocompetent individuals.","oneSentence":"The tuberculin skin test (TST) is an intradermal injection of purified protein derivative (PPD) that elicits a delayed-type hypersensitivity reaction to detect prior or current tuberculosis infection.","_ai_confidence":"high"},"_scrapedAt":"2026-03-27T23:35:49.677Z","_scrapedBy":"cloudflare-swarm","_wikipedia":null,"indications":{"approved":[{"name":"Detection of tuberculosis infection (latent or active)"},{"name":"Screening for TB exposure in healthcare workers and high-risk populations"},{"name":"Evaluation of suspected tuberculosis disease"}]},"trialDetails":[{"nctId":"NCT01212003","phase":"","title":"Training Protocol on the Natural History of Tuberculosis","status":"RECRUITING","sponsor":"National Institute of Allergy and Infectious Diseases (NIAID)","startDate":"2011-06-30","conditions":"Mycobacterium Infections, Tuberculosis, Multidrug-Resistant, Latent Tuberculosis","enrollment":150},{"nctId":"NCT06568484","phase":"PHASE2, PHASE3","title":"Bedaquiline Roll-out Evidence in Contacts and People Living With HIV to Prevent TB","status":"NOT_YET_RECRUITING","sponsor":"Johns Hopkins University","startDate":"2026-07","conditions":"Tuberculosis, Latent","enrollment":2530},{"nctId":"NCT04926922","phase":"","title":"PREVAIL VIIIa: Evaluation of Latent Tuberculosis Infection Screening Methods in People Living With Retroviral Infection in Liberia","status":"ACTIVE_NOT_RECRUITING","sponsor":"National Institute of Allergy and Infectious Diseases (NIAID)","startDate":"2021-07-27","conditions":"Tuberculosis, HIV","enrollment":200},{"nctId":"NCT06593080","phase":"NA","title":"The DECIDE-TB Trial; Validation of Treatment Decision Algorithms for Childhood Tuberculosis","status":"RECRUITING","sponsor":"Chishala Chabala","startDate":"2024-06-01","conditions":"Tuberculosis, Child Health, HIV","enrollment":30240},{"nctId":"NCT07162129","phase":"NA","title":"Online Transdiagnostic Group CBT for Postpartum Depression and Anxiety","status":"ACTIVE_NOT_RECRUITING","sponsor":"McMaster University","startDate":"2025-09-09","conditions":"Postpartum Depression (PPD), Postpartum Anxiety","enrollment":48},{"nctId":"NCT04505566","phase":"PHASE1","title":"INflammatory MediatorS in the PathophysIology of Diabetic REtinopathy Study","status":"ACTIVE_NOT_RECRUITING","sponsor":"Stephen J. 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