HIV's ancestry traced to wild chimps in Cameroon

[mrpayroll]

http://www.usatoday.com/news/health/...n_x.htm?csp=34

Updated 5/25/2006 5:03 PM ET


WASHINGTON (AP) — Twenty-five years after the first AIDS cases emerged, scientists have confirmed that the HIV virus plaguing humans really did originate in wild chimpanzees, in a corner of Cameroon.

Solving the mystery of HIV's ancestry was dirty work. Scientists employed trackers to plunge through dense jungle and collect the fresh feces of wild apes — more than 1,300 samples in all.

Before that, it took seven years of research just to develop the testing methods to genetically trace the primate version of the virus in living wild chimps without hurting the endangered species.

Until now, "no one was able to look. No one had the tools," said Dr. Beatrice Hahn of the University of Alabama at Birmingham. She led the team of international researchers that reported the success in Friday's edition of the journal Science.

"We're 25 years into this pandemic," Hahn said. "We don't have a cure. We don't have a vaccine. But we know where it came from. At least we can make a check mark on one of those."

Scientists long have known that non-human primates carry their own version of the AIDS virus, called SIV or simian immunodeficiency virus. But with one exception, it had been found only in captive chimpanzees, particularly a subspecies that in the wild populates mostly West Africa.

It was not known how prevalent the virus was in chimps in the wild, or how genetically or geographically diverse it was, complicating efforts to pin down the jump from animal to man.

Hahn's team tested chimp feces for SIV antibodies, finding them in a subspecies called Pan troglodytes troglodytes in southern Cameroon.

Chimps tend to form geographically distinct communities. By genetically analyzing the feces, researchers could trace individual infected chimps. The team found some chimp communities with infection rates as high as 35%, while others had no infection at all.

Every single infected chimp had a common base genetic pattern that indicated a common ancestor, Hahn said.

There are three types of HIV-1, the strain of the human virus responsible for most of the worldwide epidemic. Genetic analysis let Hahn identify chimp communities near Cameroon's Sanaga River whose viral strains are most closely related to the most common of those HIV-1 subtypes.

"The genetic similarity was striking," Hahn said.

The first human known to be infected with HIV was a man from Kinshasa in the nearby country of Congo who had his blood stored in 1959 as part of a medical study, decades before scientists knew the AIDS virus existed.

Presumably, someone in rural Cameroon was bitten by a chimp or was cut while butchering one and became infected with the ape virus. That person passed it to someone else.

The Sanaga River long has been a commercial waterway, for transporting hardwood, ivory and other items to more urban areas. Eventually, someone infected made it to Kinshasa.

"How many different transmission events occurred between that initial hunter and this virus making it to Kinshasa, I don't know. It could have been one, it could have been 10, it could have been 100," Hahn said. "Eventually, it ended up in an urban area, and that's where it really got going."

Somewhere in all that spread, the virus became more deadly to people than it is to chimps, who seldom are bothered much by SIV.

The research seems to settle any question of HIV's origin, said Dr. Anthony Fauci, the National Institutes of Health's AIDS chief.

When tracing a virus' evolution, "it's important to get as close to the source as you can," he said. "It's of historic interest."

Copyright 2006 The Associated Press

Chris

[Breakfast with Girls]

Presumably, someone in rural Cameroon was bitten by a chimp or was cut while butchering one and became infected with the ape virus. That person passed it to someone else.

Ape rape?

[Shagrath]

I always knew Cameron was a little shifty. Looks like I'll have to really disinfect that pig mask when I get it.

[kmac2878]

Originally Posted by Breakfast with Girls

Ape rape?

?

[nevermind]

Originally Posted by kmac2878

?

[costanza]

i did not, have sexual relations, with that monkey.

[al_bundy]

Originally Posted by kmac2878

?

is there a pic of the girl slapping the monkey?

[Jason]

[Josh-da-man]

I also read that they were able to track down a man who was living there in the 1950s, known to the locals as Bill Chimpfucker, who refused to comment beyond "It was only once. One goddamned time. And I was drunk. Leave me alone."

[Kittydreamer]

Originally Posted by Shagrath

I always knew Cameron was a little shifty. Looks like I'll have to really disinfect that pig mask when I get it.

I'm ashamed to say that I was thinking the same thing when I saw the thread title...

[TopHatCat64]

Damn dirty apes...

[Quatermass]

When I opened this page, the DVD photos at the top were

[kvrdave]

Originally Posted by Breakfast with Girls

Ape rape?

"He wanted it, Beagley Beagley."

[Giantrobo]

I didn't read the article but isn't there a Feline version of HIV?

[Groucho]

Originally Posted by Giantrobo

I didn't read the article but isn't there a Feline version of HIV?