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A to Z Health Guide 2007
The scientific bulletin of the year may be the stem-cell breakthrough. But 2007 provided a whole alphabet of big medical news. TIME's A-to-Z guide reviews them
By Coco Masters, Alice Park, Carolyn Sayre, Tiffany Sharples, Alexandra Silver and Kate Stinchfield
Allergies and asthma may be closer kin than we knew. More than half the 20 million asthma cases in the U.S. can be attributed to common allergens such as dust mites, according to a study published in the Journal of Allergy and Clinical Immunology. Exposure to some of these like cat dander at a young age may offer some protection, researchers suggested, lending support to the idea that we may be getting too clean for our own good. Another study found that children with allergies living in affluent countries, where exposure to allergens is quite low, are almost twice as likely to develop asthma as similar children living in less-developed nations.
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