Determine the Prevalence and Severity of Asthma in HIV (Human Immunodeficiency Virus) Infected Patients

Prospectively clinically phenotype and the prevalence of asthma in HIV infected patients in the Duke ID Clinic * HIV infected asthmatic subjects meeting clinical definitions for asthma compared to HIV uninfected asthma subjects identified at the DAAAC and HIV infected non-asthmatic subjects. * Prospective immunological phenotyping - HIV-infected asthma subjects prospectively identified and clinically phenotyped compared to HIV-uninfected asthma subjects identified at the DAAAC and HIV infected non-asthma subjects. Regarding the sampling method of probability sample: All samples for HIV infected asthmatic patients, HIV uninfected asthmatic patients and HIV infected non-asthmatics patients will be analyzed. Retrospectively determine overall asthma prevalence and severity among HIV-infected patients. Retrospective immunological phenotyping (circulating cytokines) of HIV-infected patients utilizing available specimens in the Duke HIV Specimen Biorepository * HIV-infected asthmatic subjects meeting asthma definition compared to overall asthma prevalence in U.S. population * HIV-infected asthma subjects meeting asthma definitions compared to matched HIV-infected non-asthma subjects