Uso de drogas y riesgos relacionados con el VIH/sida en diferentes muestras de Porto Alegre, Brasil

We comment on the bias of a historical perspective, since all studies have been conducted between 1995 and 2004, when the AIDS epidemic started to show a clear decrease in the overall number of cases due to injection drug use, and an increase in the infections due to heterosexual transmission, particularly among women. There is a great demand for preventive interventions, particularly among the poor environments, with drug users of low school background, and in large urban centers such as Porto Alegre, which are facing different risks associated with the combination of those variables and the possibility of acquiring or transmitting the virus.