I . IntroductionIn 1981 , a cluster of cases of Pneumocytis pneumonia appeared in the Los Angeles area . This exceedingly rare disease was usually seen only in persons who were immunosuppressed . Investigators soon correlated the appearance of this disease with an unusual relative incidence of a rare form of cancer of the skin and stock vessels called Kaposi s sarcoma . The people affected were all young homosexual manpower , and all showed loss of immune function . By 1983 , the pathogen make the loss of immune function had been identified as a retrocomputer virus that selectively infects certain T cells . This virus is now cognize as human immunodeficiency virus (HIV HYPERLINK http /www .questia .com /SM .qst ?act adv contributors Richard 20C 20Stroh man dcontributors Richard 20C 20Strohman Strohman , 2003There have been several theories about the product line of HIV . It is now believed that it arose by mutation of a virus that had been endemic in some areas of central Africa for many old age .
The virus has been found in blood samples preserved from as early as 1959 in several African nations and in EnglandThesis Statement : This investigates why HIV is such a undefeated pathogen and other details that an individual should know about HIVII . literature ReviewA . Opportunistic OrganismsAlthough it is convenient to categorize symbiotic relationship by type we must keep in mind that at a lower place certain conditions the relationship can change . For example , effrontery proper circumstances , a mutualistic organism such as E . coli , can become harmful . E . coli is...If you indigence to get a full essay, order it on our website:
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