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  • Jonathan Allen Cohn md

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    • Jonathan Allen Cohn is the Director of the AIDS Clinical and Educational Program at the University of Maryland. He received his MD degree from the State University of New York/Health Science Center of Brooklyn in 1976, and is currently an Assistant Professor in the Infectious Disease Division of the Department of Medicine at the University of Maryland School of Medicine.

Department of Medicine, Division of Infectious Diseases, University of Maryland Hospital, Box 243, 22 South Greene Street, Baltimore, MD 21201.


Human immunodeficiency virus-1 infects and damages or destroys several types of cells, most importantly helper/inducer (CD4 +) lymphocytes. In the majority of infected persons, the loss of CD4+ lymphocytes leads to a progressive reduction in both cell mediated and antibody mediated immunity. Early during infection most adults are asymptomatic, but after several years many develop symptoms representing a moderate degree of immune suppression. Eventually, most of these individuals become susceptible to the life-threatening opportunistic infections and cancers which define the acquired immunodeficiency syndrome. Recent advances in management, including earlier diagnosis, the use of maintenance or suppressive therapies, and specific anti-retroviral therapy with zidovudine (AZT) has nearly doubled the life expectancy for persons with AIDS. Clinical trials of new drugs, sometimes in combination with AZT, are underway. Vaccine development is proceeding, but many obstacles must be overcome before a successful vaccine can be identified.