Prevalence and risk behaviour for human immunodeficiency virus 1 infection in Marajó Island, Northern Brazil.

Background: Human immunodeficiency virus 1 (HIV-1) infection is a global public health problem, but, so far, there is no published information regarding the epidemiology of HIV-1 in Marajó Archipelago (Pará, Brazil).

Aim: The present study reports the occurrence of infection by HIV-1 in four municipalities of the Marajó Island, Pará, Brazil.

Subjects And Methods: A total of 1877 samples were collected from volunteer blood donors (1296 women and 551 men) living in the municipalities of Anajás, Chaves, Portel and São Sebastião da Boa Vista.