Two-step tuberculin skin testing of injection drug users recruited from community-based settings
Abstract:Setting: Cross-sectional study of drug users recruited from street-based settings in four US cities: Denver, Portland, Oakland and San Francisco.
Objective: To evaluate responses to two-step tuberculin skin testing among HIV-positive and HIV-negative injection drug users.
Design: Subjects were recruited from existing studies of HIV and risk behaviors for tuberculin skin testing. Those with a negative initial tuberculin test were referred for a second skin test 1–3 weeks later. A positive tuberculin test was defined as ≥10 mm, or ≥5 mm if the subject was HIV-positive.
Results: Of 997 persons receiving an initial tuberculin test, 13% had a positive response. Of 644 persons receiving a second tuberculin test, 8% had a positive response, with rates as high as 14% among those from Oakland and 12% among African Americans. HIV-positive subjects were less likely to have skin test responses ≥10 mm on the initial test (P = 0.03), or increases between the initial and second test of ≥10 mm (P = 0.06).
Conclusion: Boosting occurred in both HIV-positive and HIV-negative injection drug users. Two-step testing should be considered for this population, particularly those on whom repeat tuberculin testing will be performed.
Document Type: Regular Paper
Affiliations: 1: Division of Epidemiology, University of Minnesota, Minneapolis, Minnesota, USA 2: Urban Health Study, University of California, San Francisco, California, USA 3: Project Safe, University of Colorado, Denver, Colorado, USA 4: HIV Program, Oregon Health Division, Portland, Oregon, USA 5: Multnomah County Health Department, Portland, Oregon, USA
Publication date: April 1, 1997
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