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

Chicken Pox

MARK MCEVOY / ALAMY
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If your child isn't a huge fan of needles, he won't like this. To combat chicken pox, experts now recommend two shots instead of one — the first between 12 and 15 months and a second between 4 and 6 years. A study in the New England Journal of Medicine found that the immunizing effects of the varicella vaccine, a childhood shot routine since 1995, may eventually wear off in some youngsters — the more time since the shot, the worse the bout can be.

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