Estimation of HIV incidence among repeat anonymous testers in Catalonia, Spain.

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.

Prevalence and risk factors associated with perianal ulcer in advanced acquired immunodeficiency syndrome.

Background: The aims of this study were to evaluate the prevalence of perianal ulcer in AIDS patients with advanced disease, and to investigate risk factors associated with these lesions.

Methods: A cross-sectional study was conducted to determine the prevalence and risk factors associated with the presence of perianal ulcer in AIDS patients. A type-specific polymerase chain reaction (PCR) assay was carried out for detection of herpes simplex virus (HSV) DNA on swabs obtained from the ulcerative lesions.