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CHICAGO -- The riddle of the origin of the AIDS virus has apparently been solved, according to an international team of scientists who reported Sunday that they had traced its roots to a related virus in a subspecies of chimpanzee in Africa. The researchers, who reported their findings at the opening session of a scientific meeting in Chicago, said the simian virus was closely related to HIV-1, the type of AIDS virus that has caused the overwhelming majority of cases in the world. Since the virus jumped to humans, perhaps through exposure to blood in hunting or handling the meat of chimpanzees, it has been transmitted among humans to infect an estimated 30 million people in the world. Although scientists have long suspected that HIV-1 came from the chimpanzee, they have not been able to identify the precise subspecies until now. The subspecies is known as Pan troglodytes troglodytes, and the chimpanzee virus is known as SIVcpz, for simian immunodeficiency virus chimpanzee

The riddle of the origin of the AIDS virus has apparently been solved, according to an international team of scientists who reported today that they had traced its roots to a related virus in a subspecies of chimpanzee in Africa. The researchers, who reported their findings at the opening session of a scientific meeting here, said the simian virus was closely related to H.I.V.-1, the type of AIDS virus that has caused the overwhelming majority of cases in the world. Since the virus jumped to humans, most probably through bites and exposure to blood in hunting and dressing of chimpanzees, it has been transmitted among humans to infect an estimated 30 million people in the world. Although there have long been clues that H.I.V.-1 came from chimpanzees, how to document the link has been one of the biggest mysteries in AIDS. But, as exciting as the discovery is to the scientists, their enthusiasm has been dampened by another discovery: the subspecies is being slaughtered to ''the brink of extinction'' in its natural habitat in west and central Africa, Dr. (Beatrice H.) Hahn said. She is leading efforts to publicize the scientific dangers that she believes would result from the chimpanzee's extinction

A leading AIDS researcher at the Centers for Disease Control and Prevention said in interviews in Atlanta that tracing the source of the AIDS virus to chimps might also help scientists learn how to identify novel microbes earlier and thus prevent similar diseases from becoming epidemic. Since the recognition of AIDS in 1981, said Dr. Harold Jaffe, scientists have asked, 'If this kind of transmission happened in the past, is it continuing to go on?' The latest findings might lead to new tests to discover viruses in nature that could cause human disease. As people disturb more and more animal habitats around the world, scientists say, there is a growing risk that they will be exposed to previously unknown disease agents. Transplanting animal organs into humans, should it come into wider use, would also be an avenue for infection

The riddle of the origin of the AIDS virus has apparently been solved, according to an international team of scientists who reported Sunday they had traced its roots to a related virus in a subspecies of chimpanzee in Africa. Because the chimpanzee is able to live with the virus without falling ill, the scientists expressed hope that their discovery would eventually help improve therapies and develop an effective vaccine against the AIDS virus. The researchers, who reported their findings at the opening session of a scientific meeting here, said the simian virus was closely related to HIV-1, the type of AIDS virus that has caused the overwhelming majority of cases in the world. Since the virus jumped to humans, perhaps through exposure to blood in hunting or handling the meat of chimpanzees, it has been transmitted among humans to infect an estimated 30 million people in the world

The riddle of the origin of the AIDS virus has apparently been solved, an international team of scientists reported yesterday, saying they had traced its roots to a related virus in a subspecies of chimpanzee in Africa. As the chimpanzee is able to live with the virus without falling ill, the scientists hope their discovery would eventually help improve therapies and develop an effective vaccine against the AIDS virus. The researchers, who reported their findings at the opening session of a scientific meeting, said the simian virus was closely related to HIV-1, the type of AIDS virus that has caused the overwhelming majority of cases in the world. Since the virus jumped to humans, perhaps through exposure to blood in hunting or butchering the meat of chimpanzees, it has been transmitted among humans to infect an estimated 30 million people in the world

CHICAGO - The riddle of the origin of the AIDS virus apparently has been solved, according to an international team of scientists who reported Sunday that they have traced its roots to a related virus in a subspecies of chimpanzee in Africa. Future research needs to focus on why HIV-1 is lethal for humans while SIVcpz seems to cause no illness in the chimpanzee, even though humans and chimpanzees are 98 percent genetically similar, [Beatrice Hahn] and other scientists said. One aim will be to determine whether the different outcomes of infection in humans and chimpanzees result from tiny changes in the genetic makeup of the virus or the host. Another aim will be to understand why the chimpanzee's immune system appears to resist the damaging effects of the AIDS virus while the human's is susceptible

'That is everyone's nightmare, that there is another virus out there that either could be or has been transmitted to humans that we cannot detect with current methods. No one wants to miss detecting the next HIV epidemic.' -- Dr. Harold Jaffe, AIDS researcher at the Centers for Disease Control and Prevention The riddle of the origin of the AIDS virus has apparently been solved, according to an international team of scientists who reported Sunday that they had traced its roots to a related virus in a subspecies of chimpanzee in Africa. The researchers, who reported their findings at the opening session of a scientific meeting in Chicago, said the simian virus was closely related to HIV-1, the type of AIDS virus that has caused the overwhelming majority of cases in the world. Since the virus jumped to humans, perhaps through exposure to blood in hunting or handling the meat of chimpanzees, it has been transmitted among humans and infected an estimated 30 million people in the world

The riddle of the origin of the AIDS virus has apparently been solved, according to an international team of scientists who reported Sunday that they had traced its roots to a related virus in a subspecies of chimpanzee in Africa. The researchers, who reported their findings at the opening session of a scientific meeting in Chicago, said the simian virus was closely related to HIV-1, the type of AIDS virus that has caused the overwhelming majority of cases in the world. Since the virus jumped to humans, perhaps through exposure to blood in hunting or handling the meat of chimpanzees, it has been transmitted among humans and infected an estimated 30 million people in the world. Although there have long been clues that HIV-1 came from chimpanzees, how to document the link had been one of the biggest mysteries in AIDS. But, as exciting as the discovery is to the scientists, their enthusiasm has been dampened by another discovery: The subspecies is being slaughtered to 'the That is everyone's nightmare, that there is another virus out there that either could be or has been transmitted to humans that we cannot detect with current methods. No one wants to miss detecting the next HIV epidemic

Scientists hope their findings closely linking the AIDS virus to a virus that a type of African chimpanzee is able to live with and not become ill will eventually lead to a vaccine for human use CHICAGO -- The riddle of the origin of the AIDS virus has been solved, according to an international team of scientists who reported Sunday that they had traced its roots to a related virus in a subspecies of chimpanzee in Africa. The researchers, who reported their findings at the opening session of a scientific meeting here, said the simian virus was closely related to HIV-1, the type of AIDS virus that has caused the overwhelming majority of cases in the world. Since the virus jumped to humans, perhaps through exposure to blood in hunting or handling the meat of chimpanzees, it has been transmitted among humans to infect an estimated 30 million people in the world