The porcine epidemic diarrhea virus that's new to North America has spread to 13 states and more than 100 swine since it was detected last month, in an outbreak that's proving tougher to control than experts first thought. The illness hasn't been a serious issue among adult pigs in the U.S., but the mortality rate for piglets ranges from 50% to 100%. Experts say there is no risk to humans, but the virus continues to raise concerns among pork producers.

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