Production could decline about 7 percent this year compared to last because of this.
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A virus never before seen in the U.S. has killed millions of baby pigs in less than a year, and with little known about how it spreads or how to stop it, it’s threatening pork production and pushing up prices by 10 percent or more.

Scientists think porcine epidemic diarrhea, which does not infect humans or other animals, came from China, but they don’t know how it got into the country or spread to 27 states since last May. The federal government is looking into how such viruses might spread, while the pork industry, wary of future outbreaks, has committed $1.7 million to research the disease.

The U.S. is both a top producer and exporter of pork, but production could decline about 7 percent this year compared to last — the biggest drop in more than 30 years, according to a recent report from Rabobank, which focuses on the food, beverage and agribusiness industries.