- The Washington Times - Thursday, May 25, 2006

ASSOCIATED PRESS

Twenty-five years after the first AIDS cases emerged, scientists have confirmed that the AIDS 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.

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 today’s edition of the journal Science.

“We’re 25 years into this pandemic,” Dr. 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 nonhuman 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.

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

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

There are three types of HIV-1, the strain of the human virus responsible for most of the worldwide epidemic. Genetic analysis allowed Dr. Hahn to 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,” she said.

The first human known to be infected with HIV was a man from Kinshasa in the nearby Democratic Republic of the 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,” Dr. Hahn said.

The research seems to settle any question of HIV’s origin, said Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases at the National Institutes of Health.

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


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