Actress Christina Applegate reportedly is undergoing treatment for breast cancer.

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US actress Christina Applegate is undergoing treatment for breast cancer, according to her publicist.

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The number of Americans infected with the HIV virus is much higher than current estimates, US health officials say.

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Mixed results in the worldwide fight against HIV

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For the first time, scientists have implanted a prosthesis that will allow them to directly fuse an artificial leg into a dog’s bone, a procedure that could foster a breakthrough in designing next-generation artificial limbs for humans.

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A German farmer who lost both his arms in an accident has been successfully fitted with two new appendages in the first complete double arm transplant, his surgeons said Friday.

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Children who grow up in a spick-and-span home may have a higher risk of developing inflammatory bowel disease, a study suggests.

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New research shows that a milder type of mental decline that often precedes Alzheimer’s disease is much more common than thought.

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A New York Times columnist reported Saturday that Steve Jobs’ health problems “amounted to a good deal more than ‘a common bug,’ they weren’t life-threatening.”

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Apple’s CEO on Saturday made an important disclosure in The New York Times business section, saying that he is not suffering a recurrence of cancer. Perhaps not surprisingly, Steve Jobs did so in a fashion few other corporate chiefs would employ.

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