RESUMEN
<p><b>OBJECTIVE</b>To estimate the human immunodeficiency virus (HIV-1) prevalence of injecting drug users (IDUs) in Chongqing city.</p><p><b>METHODS</b>To apply BED-capture enzyme immunoassay (CEIA) which was based on the principle of HIV-antibody varies as the disease progress, in order to estimate both the HIV incidence and prevalence of IDUs from two IDUs surveillance sites in Chongqing.</p><p><b>RESULTS</b>During the research period, 4711 serum samples were tested by ELISA and 130 were HIV-1 positive, confirmed by Western blot. The prevalence of IDUs surveillance site A from 1999 to 2006 were 0.73%, 2.02%, 1.54%, 2.96% and 2.80%, and the incidence rates were 0.57%, 0.93%, 0,1.24% and 1.68% respectively. The prevalence of IDUs surveillance site B appeared to be 4.21%, 9.96%, 8.13%, and the incidence rates were 0.95%, 1.04% and 0.90% respectively, from 2004 to 2006.</p><p><b>CONCLUSION</b>Many of the IDUs HIV carriers in Chongqing had been infected for long time, and the incidence rates among them were steady, keeping at the same level for 1-2 years. Promotion on intervention for IDUs had produced certain effects but more attention still needs to be paid.</p>