years; having no education or only primary education completed; and having a history of STI. In total, 1,462 HIV infections were newly diagnosed among MSM during 2003-2007. Of these, 31.% were diagnosed with other STI at the same time. Factors associated with STI co-infection among new HIV cases in MSM were being Latin American; and having sex with casual partners or with both steady and casual partners. In Spain, a considerable proportion of MSM are co-infected with HIV and STI.

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Sexual transmission has replaced intravenous drug use as the most common mechanism of HIV transmission. A large percentage of patients were simultaneously diagnosed with HIV and AIDS, indicating the need for new prevention strategies.