The AIDS virus invaded the United States in about 1969 from Haiti, carried most likely by a single infected immigrant who set the stage for it to sweep the world in a tragic epidemic, scientists said on Monday.
Michael Worobey, a University of Arizona evolutionary biologist, said the 1969 U.S. entry date is earlier than some experts had believed.
The timeline laid out in the study led by Worobey indicates that HIV infections were occurring in the United States for roughly 12 years before AIDS was first recognized by scientists as a disease in 1981. Many people had died by that point.
Health & Wellness
Watching too much television may not only help make children fat, it may also raise their blood pressure, U.S. researchers said on Tuesday.
They found obese children who watched four or more hours of TV a day were three times more likely to have high blood pressure than children who watched less than two hours a day.
"There is a significant association between hours of television watched and both the severity of obesity and the presence of hypertension in obese children," Dr. Jeffrey Schwimmer of the University of California, San Diego and colleagues wrote in the American Journal of Preventive Medicine.
They found obese children who watched four or more hours of TV a day were three times more likely to have high blood pressure than children who watched less than two hours a day.
"There is a significant association between hours of television watched and both the severity of obesity and the presence of hypertension in obese children," Dr. Jeffrey Schwimmer of the University of California, San Diego and colleagues wrote in the American Journal of Preventive Medicine.
Green classrooms not only produce happier and better students, but they can save school districts thousands in energy costs.
Every day, 20 percent of Americans wake up, eat breakfast, and walk, bike, or drive to school. Once there, many students and teachers spend their days in classrooms with walls covered in toxic paint, breathing congested air, and squinting from inadequate lighting.
Every day, 20 percent of Americans wake up, eat breakfast, and walk, bike, or drive to school. Once there, many students and teachers spend their days in classrooms with walls covered in toxic paint, breathing congested air, and squinting from inadequate lighting.
With suicide as the third leading cause of death among adolescents in the United States, a new University of Denver (DU) study reveals inhaling or "huffing" vapors of common household goods, such as glue or nail polish, are associated with increased suicidal thoughts and attempts.
A classic 1959 social psychology experiment demonstrates how and why we lie to ourselves. Understanding this experiment sheds a brilliant light on the dark world of our inner motivations.
The ground-breaking social psychological experiment of Festinger and Carlsmith (1959) provides a central insight into the stories we tell ourselves about why we think and behave the way we do. The experiment is filled with ingenious deception so the best way to understand it is to imagine you are taking part. So sit back, relax and travel back. The time is 1959 and you are an undergraduate student at Stanford University...
The ground-breaking social psychological experiment of Festinger and Carlsmith (1959) provides a central insight into the stories we tell ourselves about why we think and behave the way we do. The experiment is filled with ingenious deception so the best way to understand it is to imagine you are taking part. So sit back, relax and travel back. The time is 1959 and you are an undergraduate student at Stanford University...
Children are more susceptible to avian (bird) flu than adults, a new study suggests.
Banning lead in petrol is responsible for declining crime rates in Britain, the United States and other countries, startling new research suggests.
Avian influenza, the virus that has led to the deaths of millions of birds and more than 200 people since 2003, may be more prevalent than previously thought in Europe as it goes undetected in waterfowl.
Germany's discovery of the fatal H5N1 strain in healthy ducks and geese two months ago may be a sign that domestic animals are harboring bird flu without getting sick, increasing the threat to human health, the Rome-based Food and Agriculture Organization of the United Nations said in an e-mailed release.
Germany's discovery of the fatal H5N1 strain in healthy ducks and geese two months ago may be a sign that domestic animals are harboring bird flu without getting sick, increasing the threat to human health, the Rome-based Food and Agriculture Organization of the United Nations said in an e-mailed release.
More than 3,000 people who volunteered to receive an experimental Merck and Co. AIDS vaccine are being told to come back and get extra tests because the jab may itself raise the risk of infection.
Researchers stress that they do not yet have enough information to say whether those who got the shot indeed are more susceptible to infection with HIV. But they said initial information from the trial, which was stopped suddenly last month, is worrisome.
Researchers stress that they do not yet have enough information to say whether those who got the shot indeed are more susceptible to infection with HIV. But they said initial information from the trial, which was stopped suddenly last month, is worrisome.
A defunct Canadian meatpacker is "a likely source" of beef that caused an outbreak of food-borne illnesses in the United States and Canada, the U.S. meat safety agency said on Friday.
Nearly 100 illnesses have been reported due to the E. coli O157:H7 bacteria in the two nations. The U.S. Food Safety and Inspection Service said a comparison of "DNA fingerprints" of beef samples pointed to Ranchers Beef Ltd, of Balzac, Alberta.
Nearly 100 illnesses have been reported due to the E. coli O157:H7 bacteria in the two nations. The U.S. Food Safety and Inspection Service said a comparison of "DNA fingerprints" of beef samples pointed to Ranchers Beef Ltd, of Balzac, Alberta.
