The Controversy Of How Aids Originated

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Issue:

Science

 

Written by:

Julia C

 

Date added:

December 10, 2014

 

Level:

University

 

Grade:

A

 

No of pages / words:

7 / 1859

 

Was viewed:

3558 times

 

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Essay content:

It doesn't exist [in this field]," he says. "In a sense it's all theory." Nonetheless, the theory rests on facts, and at least a few of them are undisputed -- including, most significantly, HIV's family tree. There are two species of the virus, HIV-1 and HIV-2. The first evolved from a simian immunodeficiency virus (SIV) found in chimpanzees, while the second came from an SIV in a type of monkey called the sooty mangabey...
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Within the M group -- which makes up 90 percent of all infections worldwide -- there are at least nine strains, known as "clades," of HIV-1 that are constantly mutating and merging with each other, creating yet more new varieties. "The M group epidemiologically has overwhelmed what else is out there," says Dr...
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