• 29 Mar 2000

    People infected with HIV, the virus that causes AIDS, are much less likely to pass their infection on to a sex partner if they carry a low number of viral particles in their blood.

  • 28 Mar 2000

    The notorious stomach bug Helicobacter pylori has been implicated in ailments such as chronic gastritis, peptic ulcers, and stomach cancer. Now researchers have uncovered a genetic factor that increases the risk of stomach cancer in people infected with H. pylori.

  • 27 Mar 2000

    Once thought easy prey for antibiotics, tuberculosis fought back in the 1980s and now kills more than 2 million people a year--second only to HIV among infectious diseases. Especially frightening is the appearance of strains resistant to the few drugs that, when taken together, normally cure TB.

  • 21 Mar 2000

    Detecting some tumors may become a lot simpler and less invasive in the future, according to a study published in the 17 March issue of Science.

  • 15 Mar 2000

    Medical research advocates are bemoaning their lack of star power when it comes to battling the animal rights movement.

  • 13 Mar 2000

    India has finally conquered Guinea worm, making it the second disease after smallpox to be fully eradicated from the country.

  • 13 Mar 2000

    It seemed too good to be true: Where others had only disappointing results, Werner Bezwoda found that breast cancer patients, blitzed with drugs then given a bone marrow transplant, lived longer than patients on standard chemotherapy.

  • 10 Mar 2000

    The idea of replacing faulty genes with functional ones is alluring, but it's come under severe criticism since a volunteer patient with an inherited enzyme deficiency died last fall (Science, 17 December 1999, p.

  • 8 Mar 2000

    The Elizabeth Glaser Pediatric AIDS Foundation, which supports research on HIV infection in children, is broadening its scope considerably.

  • 2 Mar 2000

    Shining some light on skin lesions and measuring the reflection may help dermatologists identify the most dangerous form of skin cancer more easily, according to a new study. The technique could help pick up the cancer in its early stages and save patients from needless biopsies.

  • 2 Mar 2000

    HIV may well be the most studied virus of all time, yet the steps between its introduction into the body by sexual intercourse and an established infection still remain mysterious.

  • 28 Feb 2000

    How can the pharmaceutical industry be enticed to make drugs and vaccines for infectious diseases that sicken or kill billions of people worldwide, yet offer little in the way of economic returns?

  • 23 Feb 2000

    WASHINGTON, D.C.--A little nicotine may go a long way toward improving the lives of people with a disease called Tourette's syndrome.

  • 18 Feb 2000

    WASHINGTON, D.C.--Doctors have known for decades about a rare metabolic disorder that boosts blood levels of an amino acid called homocysteine, causing mental retardation in severely affected children and early cardiovascular problems in others.

  • 17 Feb 2000

    Some 20 million people in the United States alone suffer from liver diseases, and more than 40,000 of them die each year. Liver transplants could save many of those lives, but there are only enough donor livers to treat about 4000 American patients each year.

  • 15 Feb 2000

    Asthma and allergies are on the rise in developed countries, and a counterintuitive theory suggests that germs are to blame--not too many germs, but not too few.

  • 3 Feb 2000

    Because cancer patients with the same diagnosis often vary widely in their response to treatment, researchers have long suspected that they might be dealing with different types of tumors.

  • 26 Jan 2000

    Researchers are planning to debate a controversial theory on the origin of AIDS. The United Kingdom's Royal Society will host a meeting in London in May to explore the contentious idea that HIV entered humans through a contaminated polio vaccine tested in Africa in the 1950s.

  • 25 Jan 2000

    The last recourse you might consider for severe arthritis would be stepping half-naked into a freezer cold enough to bring on frostbite within minutes.

  • 24 Jan 2000

    A two-fisted protein slows the clogging of veins grafted into pig arteries. The finding, reported in tomorrow's Circulation, raises the prospect of gene therapy that could help people who've had coronary bypass surgery avoid a second operation.

  • 20 Jan 2000

    WASHINGTON, D.C.--Scientists who also practice medicine are becoming an "endangered species," a group of bench researchers said yesterday.

  • 20 Jan 2000

    Rotavirus kills some 600,000 children worldwide, particularly in the developing world. Scientists have long known how the virus takes its toll: It causes the intestine to secrete copious amounts of fluid, leading to death by dehydration in vulnerable infants.

  • 11 Jan 2000

    New evidence implicates a virus in amyotrophic lateral sclerosis (ALS), the disease that killed baseball great Lou Gehrig and afflicts cosmologist Stephen Hawking. Researchers didn't catch the virus red-handed--they can't say for sure that it causes ALS.

  • 7 Jan 2000

    A new analysis of old studies has sparked a debate over whether using mammograms to screen women for breast cancer saves lives.

  • 4 Jan 2000

    Researchers have a new clue to what causes multiple sclerosis (MS), a disease in which the immune system destroys the protective sheath around nerve cells.