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Objectives: We examined sexually transmitted infection (STI), HIV, and hepatitis virus prevalence and risk behaviors among truck drivers., Methods: We asked participants about their risk behaviors, and we screened them for STIs, HIV, and hepatitis infections. We used logistic regression to identify factors associated with outcomes., Results: Of the 652 enrolled participants, 21% reported sex with sex workers or casual partners in the prior year. Driving solo (odds ratio [OR] = 15.04; 95% confidence interval [CI] = 1.92, 117.53; P = .01), history of injection drug use (IDU; OR = 2.69; 95% CI = 1.19, 6.12; P = .02), and history of an STI (OR = 2.47; 95% CI = 1.19, 5.09; P = .01) were independently associated with high-risk sexual behaviors. Fourteen percent of participants reported drug use in the previous year, and 11% reported having ever injected drugs. Participants tested positive as follows: 54 for HCV antibodies (8.5%), 66 for hepatitis B anticore (anti-HBc) antibodies (10.4%), 8 for chlamydia (1.3%), 1 for gonorrhea (0.2%), 1 for syphilis (0.2%), and 1 for HIV (0.2%). History of injecting drugs (OR = 26.91; 95% CI = 11.61, 62.39; P < .01) and history of anti-HBc antibodies (OR = 7.89; 95% CI = 3.16, 19.68; P < .01) were associated with HCV infection., Conclusions: Our results suggest a need for hepatitis C screening and STI risk-reduction interventions in this population.