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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

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 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

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

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. Because the chimpanzee is able to live with the virus without becoming ill, the scientists expressed hope that their discovery could 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

CHICAGO - The riddle of the origin of the AIDS virus has apparently been solved, according to an international team of scientists who reported Sunday having 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 eventually would 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

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. 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

A day after United Nations scientists reported that mother-to-infant transmission of the AIDS virus could be significantly cut by a new, simple drug treatment regimen, serious questions about its safety arose from a report of the deaths of two babies in a similar, separate French study. Researchers involved said the meeting's organizers did not allow them to release news of the two cases until today, even though the United Nations scientists reported the findings of their study on Monday and also spoke at a news conference. Dr. Joseph Saba, the United Nations official who reported the findings on the simpler treatment regimen, said a meeting official had told him that restrictions had been placed on information so that it was made public on specific days

United Nations scientists reported Monday that a simple, relatively inexpensive drug treatment can significantly reduce mother-to-infant transmission of the AIDS virus. The results are not as good as those from the standard treatment in Western countries, where prospective mothers infected with the virus receive the drug AZT starting at about the 26th week of pregnancy, and their babies take it for the first six weeks of life

A day after U.N. scientists reported that mother-to-infant transmission of the AIDS virus could be cut significantly by a simple drug treatment regimen, serious questions about its safety arose from a report of the deaths of two babies in a similar, separate French study. Both babies died from a rare neurological disease, French scientists reported Tuesday at a meeting in Chicago. Researchers involved said the meeting's organizers did not allow them to release news of the two cases until Tuesday, although the U.N. scientists reported the findings of their study Monday and also spoke at a news conference