The shrimp could be contaminated with a radioactive isotope called Cesium-137, although the FDA said that no products as of yet have tested positive for it.

The FDA is warning consumers not to eat certain frozen shrimp products sold at Walmart after other products from the same company tested positive for a radioactive substance.

The amount of Cesium-137 detected within the contaminated shipment would not pose an acute hazard to consumers. However, long-term consumption would pose an elevated risk of cancer.