As far back as 2001, Indiana University Professor David Flockhart, considered one of the foremost experts in fluoroquinolone-related side effects, published research linking quinolones to neurotoxicity.

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The FDA said tests on some Chinese imported fish between October and May repeatedly found traces of the antibiotics nitrofuran and fluoroquinolone, as well as the antifungals malachite green and gentian violet.

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Two years ago, the agency began to try to rescind the approval of Fluoroquinolone antibiotics in poultry, after it was determined that the drugs were creating resistant bacteria that made people sick.

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Abbott Laboratories (nyse: ABT - news - people ) subsequently withdrew its Fluoroquinolone drug, and producers, including privately held Perdue Farms and Tyson Foods (nyse: TSN - news - people ), have said they will no longer use the product.

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