Injection drug use among female sex workers in Iran: Findings from a nationwide bio-behavioural survey

Background: Globally, one in three women who inject drugs is involved in sex work which increases their vulnerability to sexually transmitted infections including HIV. This study was conducted to improve our understanding of injection drug use practices among Iranian female sex workers (FSWs) and shed light on the high-risk profile of FSWs who inject drugs (FSW-IDU5). Methods: This survey was conducted in 2010, by recruiting 872 FSWs through facility-based sampling from 21 sites in 13 cities in Iran. Data were collected through face-to-face interviews and lifetime injection drug use was assessed through the responses to the question "Have you ever injected any illicit drugs?". Independent variables included a range of socio-demographic and risk characteristics. Logistic regression models were applied to investigate the correlates of lifetime history of injection drug use. Results: Median (Q1, Q3) age of the participants was 30 (25, 37) and a total of 127 (14.6%, 95% confidence interval (CI): 12.3-17.1) had ever injected drugs. In the multivariable logistic regression model, older age (adjusted odds ratio (AOR)=AOR(25-34) (vs). (<18)=3.37, 95% CI: 1.64, 7.70; AOR(>= 35) (vs). (<18)=2.80, 95% CI: 1.11, 7.10), longer duration (>5 years) of involvement in sex work (AOR= 1.06, 95% CI: 1.02,1.10), and history of drinking alcohol (AOR = 4.42, 95% CI: 2.67, 7.32) were positively associated with lifetime history of drug injection and younger age at sex work debut (AOR = 0.52, 95% CI: 0.28, 0.96) was negatively associated with lifetime history of illicit drug injection among FSWs. Conclusion: The prevalence of injection drug use among FSWs in lran is concerning. Given the potential of this sub-population in bridging HIV into the general population, gender-sensitive and peer-led harm reduction programs should be further scaled up to meet the special needs of this vulnerable population. (C) 2017 Elsevier B.V. All rights reserved.