small proportion (4%) indicated they had never had a Pap test. In multivariate models, having a Pap test in the past year was negatively associated with income >3500 pesos/month, more years in the sex trade and having regular clients. Marginal positive associations remained with older age, reporting condom use less than half the time with non-regular clients and having any children. Discussion Prevalence of pap tests in the past year was higher than expected and may be attributed to recent efforts by the Tijuana Municipal Health Services to increase outreach to FSWs in these areas. However, since initiating sex work, only half reported the recommended yearly Pap testing which is concerning given the increased risk for HPV infection and cervical cancer among FSW. Sexual health education, including where access services, is needed to encourage regular cancer screening among this high risk population, especially among younger women and women who have been working in the sex trade for longer durations. Objective Adolescent girls diagnosed with PID are at higher risk for subsequent sexually transmitted infection (STI), pregnancy, and long-term pelvic pain. Although the 72-h post-PID evaluation provides an opportunity for risk reduction counselling, few adolescents adhere. Use of public health nurses (PHN) for clinical followup may meet the needs of this vulnerable population. The objective of this study is to estimate consumers' willingness-to-pay (WTP) for follow-up PID services by physicians and PHNs, differences by consumer type, and the differences in health-provider predicted consumer WTP values and actual consumer WTP values. Methods A contingent valuation method was used to collect WTP data regarding co-payments to physicians or nurses for clinical service delivery from the consumers of adolescent PID services (parents (n¼121) and adolescents (n¼134)) and a national sample of health providers (n¼102). Consumers were recruited from an academic paediatric practice and school-based health clinics in a large urban community with high STI prevalence. Participants completed a web-based survey with data uploaded to a secure server after obtaining online consent. Data were analysed using linear regression analyses. Results The mean WTP for physician services was $16 (SD $16.9) for clinicians, $81.9 ($34.0) for parents, and $72 (SD $ 39.1) for adolescents. The mean WTP for PHN services was $13.6 (SD $17.4) for physicians, $62.4 (SD $44.1) for parents, and $49.7 (SD $44) for adolescents. Using physician estimates for WTP as the reference group, adolescents were willing to pay $56 more (95% CI 48.6 to 63.4) for physician care and parents were willing to pay $66 more (95% CI 59.0 to 72.8) than physician's predicted controlling for informant employment status. Adolescents were willing to pay $36 more (95% CI 48.6 to 63.4) for community-based nursing care and parents were willing to pay $48 more (95% CI 59.0 to 72.8) than physician's predicted. Consumers' (adolescents' & parents') WTP for physician services were on average ...