ABC of AIDS: Development of the epidemic

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Abstract
The first recognised cases of the acquired immune deficiency syndrome (AIDS) occurred in the summer of 1981 in America. Reports began to appear of Pneumocystis carinii pneumonia and Kaposi's sarcoma in young men, who it was subsequently realised were both homosexual and immunocompromised. Even though the condition became known early on as AIDS, its cause and modes of transmission were not immediately obvious. The virus now known to cause AIDS in a proportion of those infected was discovered in 1983 and given various names. The internationally accepted term is now the human immunodeficiency virus (HIV). subsequently a new variant has been isolated in patients with West African connections—HIV-2. This article has been adapted from the forthcoming 5th edition of ABC of AIDS . The book will be available from the BMJ bookshop and at www.bmjbooks.com #### AIDS defining conditions without laboratory evidence of HIV The definition of AIDS has changed over the years as a result of an increasing appreciation of the wide spectrum of clinical manifestations of infection with HIV. Currently, AIDS is defined as an illness characterised by one or more indicator diseases. In the absence of another cause of immune deficiency and without laboratory evidence of HIV infection (if the patient has not been tested or the results are inconclusive), certain diseases when definitively diagnosed are indicative of AIDS. Also, regardless of the presence of other …

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