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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.'

GENEVA -- The scourge of AIDS now rivals the greatest epidemics of history, particularly in areas of Africa where up to one in four adults has the virus, 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 ages 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 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

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

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.'

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

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.'

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, says a United Nations 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 age 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 is infected with HIV, according to a U.N. report on Tuesday. In the first country-by-country analysis of the disease, the United Nations said 30 million people worldwide last year were infected with HIV, the virus that causes AIDS, and 21 million of them 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.'

Little can rival the misery of a medical researcher who discovers that a co-author has committed scientific misconduct. One who feels that most keenly is Dr. Cameron Bowie, emeritus director of public health in Somerset, England. Last week, Bowie retracted a published paper that had been influential in developing health policy on community care in England and that was incorporated in national testing of public health doctors. The paper, on the need for and cost-effectiveness of community-based care for the disabled, had won acclaim for Bowie and his co-author, Dr. Mark H. Williams. Fellow researchers had called it a fundamental report. Bowie had trumpeted the findings with gusto until British officials found that Williams had committed scientific misconduct, including falsifying statistics in another research paper. Williams, a trusted friend, had put Bowie's scientific credentials into question, and in an interview last week, Bowie said his 'reaction was one of disbelief that it could have happened.'