Table 1.

Inclusion and exclusion criteria

Group	Inclusion	Exclusion
Index	18 years of age or older. Recent intravenous drug use as defined by injecting at least once in the past year. HIV positive. Willing and able to provide locator information for sexual and/or injecting partners. Willing and able to provide informed consent.	Classified as at high risk for IPV (described further).
Partner	18 years of age or older. Identified by an index as either having injected with the index in the past 3 years or had sexual intercourse with the index in the past 3 years. Willing and able to provide informed consent.	None.

IPV, intimate partner violence.