Lachance said it is possible that bits of pig brain stimulated an immune response in the bodies of the workers, causing their immune systems to improperly attack their own nerve tissue.
"It is a very strong association -- the fact that we are talking about harvesting (pig brains) and potentially exposing workers to nervous system tissue and then they are coming down with a neurological syndrome," he said in a telephone interview.
Dr. James Sejvar of the U.S. Centers for Disease Control and Prevention in Atlanta said it is unlikely the condition could be passed from person to person.
"It doesn't appear this is in any way a foodborne illness," Sejvar told a media briefing. He said the processing technique used appears to be very uncommon.
"We canvassed 25 of the largest pork processors in the United States," Sejvar said. "We have identified only these three plants that use this process."
All three plants have suspended the processing practice as a precaution.
While symptoms range in severity, most of the cases are mild. "Most of these patients have relatively mild weakness on their examinations or in fact no weakness, but have a predominance of sensory symptoms. They could be walking around and not have the appearance of being ill," Lachance said.
He said those who were mildly affected received drugs that address numbness and pain, and those who were more severely affected were treated with drugs that suppress or modulate the immune system.
"No one has completely recovered," Lachance said, adding, "Most have improved to a very modest degree, mainly in terms of their fatigue and sensory symptoms."
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http://www.reuters.com/article/newsOne/idUSN1636729020080416?pageNumber=2&virtualBrandChannel=0