To blame is a virus never before seen in the United States. Reports say scientists believe this is caused by porcine epidemic diarrhea, which does not infect humans or other animals, just pigs.
The federal government and the pork industry are looking into how the virus spread, but, in the meantime, food shops could be forced to ask for more for pork.
There are no reports of the piglet-killing virus infecting people or other animals.
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