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Responding to impassioned pleas from developing countries desperately seeking a vaccine to fight the AIDS epidemic, an ethics panel convened by the United Nations is recommending major changes in the way experimental vaccines are tested in people. Earlier guidelines, intended to prevent exploitation, called for testing any experimental AIDS vaccine in the country where it was made before testing it in a developing country

Surgeons in France announced yesterday they had attached the right hand and forearm of an anonymous donor to the arm of a 48-year-old Australian man whose own hand was amputated after a logging accident in 1989. Theirs was not the first such transplant attempt; at least one previous attempt, in Ecuador in 1964, ended in failure after two weeks when the donor hand was rejected by the body. Although no such transplant is believed to have ever been successful, the team in France said advances in drugs and microsurgery since the attempt in Ecuador gave the procedure a 50 percent chance of turning out well

In certain areas of Africa, one in four adults is infected with the virus that causes AIDS, and around the world the disease now rivals the greatest epidemics of history, according to a United Nations report issued today. In the first country-by-country analysis of the disease, the United Nations said that last year 30 million people worldwide were infected with HIV, the AIDS virus, and that 21 million were in Africa. Countries south of the Sahara account for the world's 21 highest rates of HIV among adults 15 to 49 years old, the most sexually active segment of the population. In 13 of those countries, HIV has infected at least 10 percent of adults, and in Botswana and Zimbabwe, a quarter of adults are infected, a rate that even an expert described as 'shocking.'

GENEVA - In certain areas of Africa, one in four adults is infected with the virus that causes AIDS, and around the world the disease now rivals the greatest epidemics of history, according to a U.N. report issued Tuesday. In the first country-by-country analysis of the disease, the United Nations said that last year 30 million people worldwide were infected with HIV, the AIDS virus, and that 21 million were in Africa. Countries south of the Sahara account for the world's 21 highest rates of HIV among adults aged 15 to 49 years, the most sexually active segment of the population. In 13 of those countries, HIV has infected at least 10 percent of adults, and in Botswana and Zimbabwe, a quarter of adults are infected, a rate that even an expert described as 'shocking.'

The scourge of AIDS now rivals the greatest epidemics of history, particularly in areas of Africa where as many as one in four adults has the virus, according to a U.N. report issued on Tuesday. In the first country-by-country analysis of the disease, the United Nations said that last year 30 million people worldwide were infected with HIV, the AIDS virus, and that 21 million were in Africa. Countries south of the Sahara account for the world's 21 highest rates of HIV among adults aged 15 to 49 years, the most sexually active segment of the population. In 13 of those countries, HIV has infected at least 10 percent of adults, and in Botswana and Zimbabwe, a quarter of adults are infected, a rate that even an expert described as 'shocking.'

In certain areas of Africa, one in four adults is infected with the virus that causes AIDS, and around the world the disease now rivals the greatest epidemics of history, according to a United Nations report issued yesterday. In the first country-by-country analysis of the disease, the United Nations said that last year 30 million people worldwide were infected with HIV, the AIDS virus, and that 21 million were in Africa. Countries south of the Sahara account for the world's 21 highest rates of HIV among adults ages 15 to 49, the most sexually active segment of the population. In 13 of those countries, HIV has infected at least 10 percent of adults, and in Botswana and Zimbabwe, a quarter of adults are infected, a rate that even an expert described as 'shocking.'

The AIDS epidemic rivals the greatest of history, particularly in areas of Africa where as many as one in four adults has the virus, according to a U.N. report issued Tuesday. In the first nation-by-nation analysis of the disease, the United Nations said that last year 30 million people worldwide were infected with HIV, the AIDS virus, and that 21 million of them were in Africa. Nations south of the Sahara account for the world's 21 highest rates of HIV among people ages 15 to 49, the most sexually active segment of the population. In 13 of those nations, HIV has infected at least 10 percent of adults, and in Botswana and Zimbabwe, a quarter of adults are infected, a rate that even an expert described as shocking

Pleas for national leaders to muster the political courage to carry out strong prevention programs to stop the global epidemic of AIDS were sounded at the opening of the 12th World AIDS Conference in Geneva, Switzerland, on Sunday

AIDS now rivals the greatest epidemics of history, particularly in areas of Africa, where as many as one in four adults has the virus that causes the disease, the United Nations said Tuesday. The U.N. report said 30 million people were infected last year with HIV, the AIDS virus, with 21 million of them in Africa. The rate of HIV among adults was at least 10 percent in 13 of the countries south of the Sahara; in Botswana and Zimbabwe, one-fourth are infected

In certain areas of Africa, one in four adults is infected with the virus that causes AIDS, and around the world the disease now rivals the greatest epidemics of history, according to a United Nations report issued today. But where plague and influenza killed in days, death from untreated AIDS takes about a decade, making it a quieter epidemic that national leaders have too easily ignored, officials from the United Nations AIDS Program said. Dr. (Peter) Piot, a Belgian who has worked with AIDS in third world countries for more than 15 years, called the new H.I.V. figures staggering and said he was ''shocked'' when he learned that 25 percent of an entire country's adults were infected. At first, both Dr. Piot and Dr. Bernhard Schwartlander, the United Nations epidemiologist who led the analysis, said they suspected a statistical error