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iStockphoto/africa924africa924 PHILADELPHIA Severe malnourishment of mothers and their children can cause lifelong growth deficiencies and health problems, warned scientists at the American Society of Tropical Medicine and Hygiene annual meeting in Philadelphia on Wednesday. But a lack of nutritious food isn t the only culprit

Asthma rates have been surging around the globe over the past three decades, and for a long time researchers thought they had a good idea of what might be fueling the increase: the world we live in is just a little too clean. According to this notion--known as the hygiene hypothesis--exposure in early childhood to infectious agents programs the immune system to mount differing highly effective defenses against disease-causing viruses, bacteria and parasites.