USE OF AN ILLEGAL SYRINGE EXCHANGE AND INJECTION-RELATED RISK BEHAVIORS AMONG STREET-RECRUITED INJECTION-DRUG USERS IN OAKLAND, CALIFORNIA,1992 TO 1995

Objective: To determine factors associated with syringe and injection supply sharing among injection drug users (IDUs) in a community with a n illegal underground syringe exchange program (SEP). Methods: From 19 92 to 1995, semiannual cross-sectional samples of IDUs were recruited in Oakland, California. To account for multiple observations from the same individual, we used general estimating equations with legit trans formations to determine factors associated with sharing syringes and o ther injection supplies. Results: 1304 IDUs were interviewed; 684 (53% ) returned for more than one interview. 2830 interviews were available for analysis. SEP use increased and syringe and supply sharing declin ed from 1992 to 1995 among study participants. In multivariate analysi s, SEP users were less likely to share syringes than non-SEP users (ad justed odds ratio [AOR] = 0.57; 95% confidence interval [CI] = 0.46-0. 72). SEP use was not significantly associated with the sharing of inje ction supplies (AOR = 0.85; 95% CI = 0.68-1.07). Syringe sharing and i njection supply sharing were significantly less likely to occur among African American and HIV-positive IDUs. Conclusions: These data sugges t that illegal SEPs can be effective HIV prevention programs. Lower ra tes of syringe-based risk behaviors among African American and HIV-pos itive IDUs are encouraging.