• 12 Mar 1997

    Medical sleuths have lifted an indictment against a suspected hepatitis virus. Two studies in tomorrow's New England Journal of Medicine all but remove the blame from the so-called hepatitis G virus (HGV), which is found in 1% to 2% of blood donors.

  • 7 Mar 1997

    A chemical group attached to one end of a DNA molecule appears to cause a patch of damaged DNA far down the double helix to be mended. This startling case of "chemistry at a distance," as one scientist calls it, suggests that long-range DNA repair of some kind might play a role in normal cells.

  • 5 Mar 1997

    The National Institute of Allergy and Infectious Diseases (NIAID) announced today a new program that will quickly pour $6 million into grants to pursue risky, novel ideas for an AIDS vaccine. NIAID is hoping that this injection of cash will rev up a field that has all but stalled.

  • 28 Feb 1997

    Low-tar cigarettes may reduce your chance of getting one kind of lung cancer, but they boost your risk of another lung cancer type, says a study reported in next month's issue of the journal Cancer.

  • 27 Feb 1997

    For the first time, scientists have discovered a pig retrovirus that infects human cells.

  • 27 Feb 1997

    AIDS researchers were encouraged last year when they found that people with a specific genetic defect appeared to be protected from infection by HIV. But a new finding, reported in the March issue of Nature Medicine, indicates that this protection is not absolute.

  • 26 Feb 1997

    People with cystic fibrosis are prone to killer lung infections. But scientists have been puzzled over how the genetic defect underlying the disease--a mutated gene that leads to poor transport of chloride into and out of cells--promotes these infections.

  • 25 Feb 1997

    LONDON--Scientists have for the first time used a vaccine made inside a plant to protect animals--in this case minks--against a viral disease.

  • 24 Feb 1997

    PHILADELPHIA--Last year, David Berd, an oncologist at Thomas Jefferson University here, found that melanoma patients given an injection of altered versions of their own tumor cells after surgery were nearly twice as likely to remain tumor-free as were patients given

  • 24 Feb 1997

    A new study suggests that people living near the Three Mile Island nuclear power plant in 1979, when it released radioactive gas into the air, may have suffered from a higher rate of some cancers in the first several years after the accident.

  • 24 Feb 1997

    Creating a whole new organism from a single cell has been more the stuff of science fiction than of science. Not anymore. Scientists have cloned a lamb using a cell nucleus taken from an adult ewe's udder, according to a report scheduled to appear later this week in Nature.

  • 21 Feb 1997

    In a long-awaited feat, scientists have created a line of mice with symptoms that mimic adult-onset diabetes.

  • 18 Feb 1997

    SEATTLE--Researchers may have found a new explanation for why some people seem to fend off the AIDS virus.

  • 13 Feb 1997

    Hopes for risk-free hormone replacement therapy for menopause have dimmed with a report that a regimen thought to reduce its dangers does not offer complete protection.

  • 12 Feb 1997

    Talking on your car phone while you are driving can be a dangerous practice. A report in tomorrow's issue of The New England Journal of Medicine concludes that you may run about the same risk of having an accident as you would if you were legally drunk.

  • 11 Feb 1997

    Pathogens that come in multiple strains, such as the influenza virus or HIV, are the bane of vaccine developers: A vaccine effective against one strain may provide little immunity to others.

  • 10 Feb 1997

    A clot-busting drug called tissue plasminogen activator (tPA) is among the most costly medicines on the market. A single dose costs $2000.

  • 7 Feb 1997

    The leptin hormone is no longer alone on the list of proteins that appear to play a key role in regulating weight gain.

  • 5 Feb 1997

    The amino acid L-arginine appears to reduce blood pressure and other risk factors for heart disease.

  • 3 Feb 1997

    A protein that triggers the growth of blood vessels appears to play a key role in the development of Kaposi's sarcoma.

  • 3 Feb 1997

    The dream of many family planners is a birth control pill for men, something that would somehow shut off sperm production but leave sex drive and beards intact. For years, researchers have targeted follicle-stimulating hormone (FSH) for this delicate task.

  • 29 Jan 1997

    Researchers in Argentina may have found the first known cases of person-to-person transmission of hantavirus, an often lethal infectious agent normally transmitted only by rodents.

  • 28 Jan 1997

    University officials are applauding a federal appeals court decision throwing out charges by a former graduate student that her school defrauded the federal government by wrongly taking credit for her work in grant applications.

  • 28 Jan 1997

    BETHESDA, MARYLAND--Recent reports that the DNA of a monkey virus called SV40 lurks in some rare types of human cancers has reignited a nearly 40-year-old controversy over the safety of a polio vaccine that was widely administered in the late 1950s.

  • 28 Jan 1997

    WASHINGTON, D.C.--There may be a magic bullet after all.