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The virus that causes AIDS is spreading in New York City at three times the national rate — an incidence of 72 new infections for every 100,000 people, compared with 23 per 100,000 nationally.

An appeals committee at Purdue University has upheld findings of misconduct by Rusi P. Taleyarkhan.

Biologists at Harvard have converted cells from a mouse’s pancreas into the insulin-producing cells that are destroyed in diabetes.

Has reality television and the Internet pushed people over the line?

Patients and dentist work together to create that perfectly flawed smile.

The company is halting some pricing practices that critics say were contributing to overuse of its flagship anemia drug Aranesp at a time of mounting concerns about the product’s safety.

Dr. Weller was a tropical-medicine specialist whose tissue-culture research in 1949 made development of the Salk and Sabin polio vaccines possible.

An ovarian cancer test prompts questions on regulation and risk, and experts worry it may mean unneeded surgery.

Many men may have unrealistic expectations about life after prostate surgery, leading to high levels of regret.

A salad with many variations on a theme of yogurt, cucumbers, garlic and fresh herbs.

The diabetes drug Byetta was linked to four more deaths in patients with pancreatitis, adding to two deaths announced by federal regulators last week.

Dr. Thomas Graboys’ memoir of dealing with Parkinson’s disease stands out as a small wonder.

The complications from concussions, a signature injury of the Iraq war, often are not recognized in singular ways.

Former Prime Minister Margaret Thatcher has been suffering from dementia for at least the past eight years, according to a memoir published by her daughter.

Stanford University is concerned about the practice that has led drug makers to pay for the annual refresher courses of most of the country’s doctors.

A new virus that infects the world’s most dangerous mosquito could one day be manipulated to kill it or prevent it from transmitting malaria.

Compared with their peers in 1991, high school students today are less likely to be sexually active, and when they are, more likely to use condoms.

Getting older doesn’t have to mean getting frailer.

Chewing gum after abdominal surgery may help in recovery, British researchers found in a review of several small studies.

Consumption of monosodium glutamate, or MSG, the widely used food additive, may increase the likelihood of being overweight, a new study says.