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  1. Health & Medicine

    Transfusions and transplants spread West Nile virus

    Donated blood and organs should be screened to prevent transmission of West Nile virus, federal officials say.

    By Ben Harder
  2. Health & Medicine

    Africa faces new meningitis threat

    A vaccine-resistant and previously rare strain of deadly bacteria caused an epidemic of meningitis last year in western Africa and seems to have disseminated around the world.

    By Ben Harder
  3. Health & Medicine

    Vaccine didn’t cause heart deaths

    Fatal heart attacks that recently struck two people after they were vaccinated against smallpox were probably unfortunate coincidences, not adverse consequences of vaccination.

    By Ben Harder
  4. Physics

    Fusion device crosses threshold

    By sparking thermonuclear reactions, a machine called Z has joined the big leagues among potential technologies for producing power from controlled nuclear fusion.