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Aids

2013-11-13 来源: 类别: 更多范文

Aids An infectious disease can be defined as an illness effecting a human or animal caused by a virus, bacteria, parasite or fungus. They can be spread by direct contact with an infected person or animal, ingesting contaminated food or water, contact with a vector, or contact with a contaminated surrounding such as animal droppings or air. As technology increases and researchers learn, treatment for many diseases is available. So one may ask, why do infectious diseases reemerge' The problem is that some microbes have evolved. They have demonstrated their outsmarting ability to adapt, survive and challenge us yet again. One such disease is Acquired Immuno-Deficiency Syndrome or AIDS/HIV. Last year alone, over forty million people were infected with AIDS and three million died. AIDS was introduced by a small group of rats that came to Italy abroad a traading ship from Turkey. Small Pox transmitted by trade goods from the Hudson Bay Company wiped out the entire Native American tribes. In the early 1980\'s , The Center for Disease Control and Prevention became aware that a new “virus” was effecting certain segments of society. In 1985, researchers isolated the virus virus, hiv, infected, disease, person, symptoms, infection, cells, one, blood, aids, system, test, host, first, vaccine, three, results, include, immune, human, however, exposure, drugs, dna, contact, body, because, zidovudine, year, through, second, same, problem, positive
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