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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.

Chinese authorities tried to calm spreading health concerns Wednesday after a third person was reported to have died from a new type of bird flu. The emergence in China of the H7N9 strain of avian flu — a total of nine cases have been reported since it was revealed last weekend — are troubling because the strain has not previously been found in humans.

Parents taking infants on long flights are turning to medication to help their children sleep. But is the practice safe - or a dangerous abuse of parental power?

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.

Perhaps, like me, you’ve wondered what percentage of retail meat has foodborne pathogens, and of those, which pathogens are antibiotic resistant. Well, you’re in luck. The Food and Drug Administration’s National Antimicrobial Resistance Monitoring System puts out a yearly report looking at the rates of antibiotic resistance of foodborne pathogens in retail meat and poultry samples. A thorough examination, the Retail Meat Report is hefty chunk of research to wade through. Because of this, it’s not easy to make conclusions on the prevalence of antibiotic resistance in the meat case just by reading through the report’s 80-plus pages.

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.

Health officials are urging 7,000 patients of an Oklahoma dentist to seek medical tests to ensure they haven't been exposed to hepatitis or the virus that causes AIDS. The Oklahoma and Tulsa health departments say the patients may have been exposed to viruses at clinics operated by W. Scott Harrington. The agencies said they found "major violations" of the Oklahoma Dental Act.

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.

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.

Genetically altering a patient’s immune cells has, for the first time, produced remissions in adults with a deadly type of acute leukemia. In one patient, all trace of the disease vanished in 8 days.