"We know HIV-1 comes from chimpanzees but we know little beyond this, " he said.
Only occasionally, as with the M strain of HIV-1, does the chatter lead to a serious epidemic.
However, they also found that the virus is very different to all strains of HIV-1, which has infected humans.
"HIV-1 did not originate from polio vaccines that were tested in that area in the 1950s, " said Dr Worobey.
Unlike the widespread HIV-1 M strain, and the much rarer N and O strains, which jumped to people from chimpanzees, the newly described P strain originated in gorillas.
What sets Portland, Oregon-based CytoDyn (CYDY) apart from the pack is its pipeline of three ground-breaking therapies, PRO 140 and Cytolin entry-inhibitor antibodies for R5 HIV-1 (the most common, most virulent strain of HIV worldwide).
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Other initiatives backed by the US aim to bring antiretroviral drugs to 1.5 million HIV-positive pregnant women to prevent them from passing the virus to their children, and to distribute more than one billion condoms in the developing world.
The report says studies show that if 15% of a country's population is HIV-positive, its GDP will decline by 1% annually.
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The Rwinkwavu Hospital has treated 1, 995 patients with HIV drugs--and kept 96% of them alive.
In 2003, the region suffered the second highest rate of new infections in the world with almost 1.37 million people becoming HIV-positive.
The number of HIV-positive people receiving life-saving ARV drugs more than doubled from 678, 500 to 1.5 million after he took office, according to official statistics.
Within 50 years the prevalence of HIV would drop below 1%, compared with up to 30% at the moment in the worst-affected areas.
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