Exposure symptoms match what they already know, and include memory loss and possible cancer. The substance that has poisoned his livestock can be passed on to humans by eating beef and drinking milk which is why his family is sick… his wife can no longer breast feed her baby, as that too would pass on any PBB she has in her body. The substance is cumulative, its is firmly in the food chain, the long term effects are quite unknown, and there is no way to remove the contamination once it has been passed.
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My Conspiracy mind is going wild about the possibilities here..
Add the newly recommended low salt diets and restricted access to Ascorbic Acid..