Local drug use situations can change rapidly, and such changes may create increased risk for HIV transmission. The introduction of cocaine injecting, which can greatly increase the frequency of injecting and require much greater supplies of sterile syringes, has served as a dramatic example [22]. Monitoring the local drug use situation can be done with informal discussions, qualitative interviews, focus groups and formal structured surveys, which may include HIV and HCV testing. As noted above, monitoring the local drug use situation can also provide critical information regarding the syringe coverage in the local area. If the monitoring should detect a situation that threatens increased HIV transmission, the SSP should immediately explore the situation in greater depth and adjust services to minimize any possible outbreak of HIV transmission.
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