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By tracking one patient’s immune response, scientists have tracked how a series of mutations led to an antibody that can defeat many H.I.V. strains.

The proportion of American adolescents who exercise regularly, eat a healthy diet and are free of risk factors for future heart disease is "alarmingly low," says a major new survey of teen health.

The rape and murder of a young woman in New Delhi in December followed by two attacks on foreign female travelers has altered how tourists view India and led to a sharp fall in the numbers of foreign tourists, especially women, a study said....

A large new government study should reassure parents who are afraid that kids are getting autism because they receive too many vaccines too early in life. The study, by researchers at the Center for Disease Control and Prevention, found no connection between the number of vaccines a child received and his or her risk of autism spectrum disorder. It also found that even though kids are getting more vaccines these days, those vaccines contain many fewer of the substances that provoke an immune response.

The menus offered to children by most U.S. restaurant chains have too many calories, too much salt or fat, and often not a hint of vegetables or fruit, according to a study by the Center for Science in the Public Interest. The group, which has agitated for everything from healthier popcorn at the movies to calorie labeling in supermarkets, found that among almost 3,500 combinations surveyed, kids' meals failed to meet nutritional standards 97 percent of the time.

Medical claims costs — the biggest driver of health insurance premiums — will jump an average 32% for Americans' individual policies under the Affordable Care Act health care law, according to a study out Tuesday by the nation's leading group of financial risk analysts.

A growing body of evidence suggests that all the antibacterial-wiping, germ-killing cleanliness of the developed world may actually be making us more prone to getting sick — and that a little more dirt might help us stay healthier in the long run.

Using Google’s enormous Ngram database, researchers at three British universities tracked the use of “mood” words over the 20th century.

More than 35 years after it launched on a mission to explore the cosmos, NASA's unmanned Voyager spacecraft appears to have left the solar system and is in a "new region" of space, said a study Wednesday.

An estimated 17,616 people wound up in U.S. emergency rooms between 2002 and 2012 because they caught their genitals, almost always penises, in zippers, according to a new study.