None of the staff members had ever seen a strand of virus that could do so much close to the immune system like this one did. Many theories slightly this disease were in question. Many scientists believed it originated in Africa. Many perspective the virus existed in humans in South primeval Africa for hundreds and thousands of years, causing only minor symptoms in isolated groups until it outflank more widely. AIDS could al...If you want to get a dear essay, order it on our website: Orderessay
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