“…Initial HIV screening used Genetic Systems ELISA (Redmond, WA, USA); this was confirmed using BIO‐RAD NOVAPATH Western blot (Hercules, CA, USA). - Hepatitis B tests assayed surface antigen (AUS ZYME monoclonal), core antibody (CORE ZYME) and surface antibody (AUSAB EIA) (all from Abbott, Abbott Park, IL, USA). Subjects were coded as having been infected at some time if they were positive for any of these markers except if they were positive only on surface antibody (which was treated as putative evidence of vaccination—in which case, like subjects with no data, they were excluded from the denominator in estimates of percentage ever infected).
- Hepatitis C antibody was measured using the Abbott EIA screening assay and confirmed by Ortho Diagnostics RIBA‐2 (Raritan, NJ, USA).
- Herpes simplex virus type 2 antibody was determined using Gull Laboratories (Salt Lake City, UT, USA) glycoprotein type‐specific ELISA test (Ashley et al . 1998).
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