Michigan residents were increasingly alarmed over the past three years as officials quarantined more than 500 farms and ordered the destruction of thousands of cows, swine, sheep and chickens (TIME, May 10). These animals and such farm products as cheese and eggshad been contaminated by a fire retardant containing polybrominated biphenyls, or PBBs, that had accidentally been mixed with feed. But after examining farm families exposed to PBBs, the Michigan Department of Health announced that it had found no evidence that the chemicals had caused ill effects in humans. That reassuring conclusion was apparently premature. A medical study released last week...
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