A 70-year-old woman is dead and man critically ill after receiving kidneys at Boston hospitals from a donor who carried an undetected virus.

The 57-year-old man who received a kidney from the same donor is also infected with the hard-to-detect lymphocyte choriomeningitis virus or LCMV, the Boston Globe said Tuesday

South Korea on Monday slaughtered and buried around 15,000 poultry in Seoul to prevent further spreading of the deadly H5N1 strain of bird flu in the capital. Quarantine officials reported culling chickens, ducks, pheasants and turkeys raised in farms, restaurants, schools and homes in the capital.

Monday's culling resulted from a second case of bird flu confirmed in Seoul on Sunday, less than a week after the first one was detected. On Sunday, two outbreaks of the H5N1 virus were reported in poultry farms in Busan, country's second largest city, and Ansung

The value of bed rest on human health will be the subject of a four-month study by NASA scientists at the University of Texas Medical Branch in Galveston.

Participants will stay in a special research unit for the duration of the study and eat a controlled diet

The rise in number of clostridium difficile-related deaths in Ontario has prompted Canadian Health Minister George Smitherman to order all hospitals to report cases of the superbug to the ministry.

So far 76 confined at the Joseph Brant Memorial Hospital in Burlington have died the past 20 months from direct and indirect exposure to the superbug bacteria, which leads to severe diarrhea

Researchers of McGill University have found an HIV test using saliva to be effective in preventing pregnant Indian mothers from passing the virus to their newborns.

The OraQuick test, which was approved by the U.S. Food and Drug Administration in 2004, lets doctors know within 20 minutes if a laboring pregnant mom is HIV-infected. The early detection of infection allows doctors to immediately administer anti-retroviral drugs to HIV-exposed infants, a method proven effective in preventing infection of babies from the virus that causes AIDS