Walmart has removed imported frozen shrimp from store shelves in 13 states after the Food and Drug Administration said that contamination from a radioactive isotope had been found in shipping containers and in one sample.

The recalled shrimp won’t make you glow green. The FDA said that no frozen shrimp that tested positive for the isotope, cesium-137, had reached stores. And Barbara Kowalcyk, director of the Institute for Food Safety and Nutrition Security at George Washington University, said the risk to the public was very low.

“I think they’re doing the recall as a precautionary approach,” she said in an interview Wednesday.

The FDA urged consumers on Tuesday to throw out certain packages of Great Value-brand frozen raw shrimp that they purchased at Walmart stores in Alabama, Arkansa

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