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 carnal knowledge incidence of a rare form of cancer of the undress and stock vessels called Kaposi s sarcoma . The people affected were all young man 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 / entanglement .questia .com /SM .qst ?act adv contributors Richard 20C 20Stroh man dcontributors Richard 20C 20S trohman Strohman , 2003There have been several theories most the product line of HIV . It is now believed that it arose by fun 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 someone should know about HIVII . literature ReviewA . Opportunistic OrganismsAlthough it is convenient to categorise symbiotic relationship by type we must happen in mind that at a lo wer endow certain conditions the relationsh! ip can change . For example , supposal proper circumstances , a mutualistic organism such as E . coli , can become harmful . E . coli is...If you motive to get a full essay, order it on our website:
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