HIV/AIDS Causes and Risk Factors  
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Do You Know How HIV Spreads?
It's A Fact.
Half of the new HIV infections reported each year occur in people 25 years of age and under
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How HIV Causes AIDS
A significant component of the research effort of the National Institute of Allergy and Infectious Diseases (NIAID) is devoted to the pathogenesis of HIV (human immunodeficiency virus) disease.

http://www.niaid.nih.gov
The Evidence that HIV Causes AIDS
"AIDS is caused by infection with a virus called human immunodeficiency virus (HIV). This virus is passed from one person to another through blood-to-blood and sexual contact

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Causes of HIV and AIDS
HIV disease is characterized by a gradual deterioration of immune function. Most notably, crucial immune cells called CD4+ T cells are disabled and killed during the typical course of infection.

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Causes of HIV - How the epidemic starts
Nobody knows for sure exactly what causes HIV. Researchers certainly know how the virus is made up and how it attacks the body - but where it actually came from is a medical mystery

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HIV Risk Factors by Sexual Acts
Risk of infection with HIV shown in a table characterize by High Risk, Moderate Risk and Low Risk
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http://iomfats.org