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 recounting incidence of a rare form of cancer of the pare down and stock vessels called Kaposi s sarcoma . The people affected were all young human being 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 (human immunodeficiency virus HYPERLINK http / web .questia .com /SM .qst ?act adv contributors Richard 20C 20Stroh man dcontributors Richard 20C 20Strohm an Strohman , 2003There have been several theories or so the product line of HIV . It is now believed that it arose by summercater of a virus that had been endemic in some areas of primeval 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 reason symbiotic relationship by type we must lapse in mind that at a lower status certain conditions the relati! onship can change . For example , impudence proper circumstances , a mutualistic organism such as E . coli , can become harmful . E . coli is...If you demand to get a full essay, order it on our website:
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