How was hi discovered 1980-1981, 5 young men, all active homosexuals, were treated for Pneumocystis carini pneumonia(PCP)in LA, CA. The symptoms suggest the possibility of cellular-immune dysfunction Clusters of PCP and Kaposi's sarcoma observed in other hospitals 1982 disease started to be called aids Found transmitted at birth and heterosexually Virus was first isolated in 1983 from the lymph node of a patient with lymphadenopathy in Paris 1984 Electron microscopy and sequence anal ysis revealed hiv to be a lentivirus, known group of retrovirusesHow was HIV discovered • In 1980-1981, 5 young men, all active homosexuals, were treated for Pneumocystis carinii pneumonia (PCP) in LA, CA. The symptoms suggest the possibility of cellular-immune dysfunction. • Clusters of PCP and Kaposi’s sarcoma observed in other hospitals. • 1982 disease started to be called AIDS. • Found transmitted at birth and heterosexually. • Virus was first isolated in 1983 from the lymph node of a patient with lymphadenopathy in Paris. • 1984 Electron microscopy and sequence analysis revealed HIV to be a lentivirus, known group of retroviruses