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The common thread among the affected workers is that they all worked in a part of the plants that used compressed air to blow pig brains out of skulls, Lachance said. All the plants have discontinued the practice.
The working hypothesis, he told reporters, is still that some of the brain tissue was turned into a fine mist during the process, and that the workers became exposed to it and somehow developed an autoimmune response that caused nerve damage.
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Beware Pig Brain Mist!!! Who knew!
Nation & World | Illnesses rise among plant workers who handled pig brains | Seattle Times Newspaper
