Clinical aspects of influenza A (H1N1) in HIV-infected individuals in São Paulo during the pandemic of 2009.

Objective: To describe the clinical aspects of H1N1 among HIV coinfected patients seen at a reference center for AIDS treatment in São Paulo, Brazil.

Design: Observational and prospective cohort study.

Methods: Descriptive study of clinical and laboratory investigation of HIV-infected patients with confirmed diagnosis of influenza A (H1N1) in 2009.