title: Estimation of HIV incidence among repeat anonymous testers in Catalonia, Spain.
abstract: A retrospective cohort study of 2124 repeat HIV testers attending at anonymous testing sites (ATS) of Catalonia between 1995 and 2001 registered 3273 person-years (PY) of follow-up and 76 seroconversions (incidence density of 2.32 per 100 PY; 95% CI: 1.83, 2.90). The highest HIV infection incidence was observed among heterosexual injection drug users (IDU) (9.25 per 100 PY; 95% CI: 6.77, 12.25) and the lowest was among heterosexual non-IDU (0.69 per 100 PY; 95% CI: 0.35, 1.24). In multivariate Cox regression, factors independently associated with seroconversion were men having sex with men, IDU, and having sex with a known HIV-infected person. In spite of some limitations, such results suggest that prevention interventions targeting specific groups attending at ATS in Catalonia should be prioritized.
authors.affiliation: Center for Epidemiological Studies on HIV/AIDS in Catalonia, Hospital Universitari Germans Trias i Pujol, Badalona, Spain.
authors.forename: Cristiane Murta Ramalho
authors.initials: CM
authors.lastname: Nascimento
authors.forename: Maria Jesús
authors.initials: MJ
authors.lastname: Casado
authors.forename: Jordi
authors.initials: J
authors.lastname: Casabona
authors.forename: Rosa
authors.initials: R
authors.lastname: Ros
authors.forename: E
authors.initials: E
authors.lastname: Sierra
authors.forename: Kati
authors.initials: K
authors.lastname: Zaragoza
authors.forename: Nuria
authors.initials: N
authors.lastname: Barberà
authors.forename: Xavier
authors.initials: X
authors.lastname: de Vega
authors.forename: Carmen
authors.initials: C
authors.lastname: Oliver
mesh_terms: D015492:AIDS Serodiagnosis; D000328:Adult; D035041:Anonymous Testing; D005260:Female; D015658:HIV Infections / Q000175:diagnosis / Q000453:epidemiology* / Q000635:transmission; D020010:Heterosexuality; D018451:Homosexuality, Male; D006801:Humans; D015994:Incidence; D008297:Male; D008875:Middle Aged; D012725:Sexual Behavior; D013030:Spain; D015819:Substance Abuse, Intravenous