A recall has been issued for frozen shrimp sold at Walmart in 13 states that may have been contaminated with a radioactive chemical, the Food and Drug Administration said.

On Tuesday, Aug. 19, the FDA advised the recall after it detected Cesium-137 (Cs-137), a radioactive chemical "produced by nuclear fission for use in medical devices and gauges," according to the Environmental Protection Agency.

The chemical was detected in four U.S. ports across the country and in a sample of breaded shrimp, the FDA stated.

"Although testing to date has not confirmed the presence of contamination in any product in commerce, the product appears to have been prepared, packed, or held under insanitary conditions whereby it may have become contaminated with Cs-137 and may pose a safety concern," the

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