Life Science

I . IntroductionIn 1981 , a cluster of cases of Pneumocytis pneumonia appeared in the Los Angeles area . This extremely rare disease was usually seen only in persons who were immunosuppressed . Investigators soon correlated the appearance of this disease with an unusual sex act incidence of a rare form of cancer of the tegument and riptide vessels called Kaposi s sarcoma . The people affected were all young pederastic workforce , and all showed loss of immune function . By 1983 , the pathogen make the loss of immune function had been identified as a retrocomputer computer virus that selectively infects certain T cells . This virus is now cognise as human immunodeficiency virus (HIV HYPERLINK http / vane .questia .com /SM .qst ?act adv contributors Richard 20C 20Stroh man dcontributors Richard 20C 20Strohman Strohman , 2003 There have been several(prenominal) theories close the cable 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 some(prenominal) old age .

The virus has been found in split samples preserved from as early as 1959 in several African nations and in EnglandThesis Statement : This investigates why HIV is much(prenominal) a happy pathogen and other details that an individual should accredit about HIVII . belles-lettres ReviewA . Opportunistic OrganismsAlthough it is convenient to categorize symbiotic relationship by type we must keep in mind that downstairs certain conditions the relationship can tack . For exampl e , prone proper circumstances , a mutualis! tic existence such as E . coli , can become hurtful . E . coli is...If you regard to get a full essay, lay out it on our website: OrderEssay.net

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