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evolutionary biology

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BIL 116

Chapter 1 Understanding HIVWhy study evolutionoThe tools and techniques of evolutionary biology offer crucial insights into matters of life and death Human Immunodeficiency Virus HIV causes Acquired Immune Deficiency Syndrome AIDSoHIV is an emerging virus it rapidly evolves drug resistance and it is deadly Evolutionary biology is the science devoted to understanding two thingsoHow populations change through time following modifications in their environmentoHow new species come into being 11The Natural History of the HIVAIDS EpidemicList of worst epidemic in human history according to the number of deathsoInfluenza50 to 100 million deathsacross the globeoBlack Death 13471352took 3050 of the European populationabout25 million lives oNew World small poxreleased in 1520 by European conquistadoresdecimated Native American populations across two continentsAIDS is among the worst epidemics in human historyoWas first recognized in 1981oSo far infected more than 65 million people o25 million have already died oBy year 2020 a total of 90 million lives would have been claimed by AIDSoAccording to World Health Organization AIDS is responsible for about 49 of all deaths worldwideoSubSaharan Africa is mostly affected by this epidemicHIV establishes a new infection when a bodily fluid holding the virus usually a blood or semen carries it from an infected person directly onto a mucous membrane or into the bloodstream of an uninfected personoCan be passed during heterosexual sex homosexual sex oral sex needle
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