Days after the FDA issued a do-not-eat warning about imported shrimp sold at Walmart, a Florida company actually issued a recall of that shrimp and a California company recalled shrimp sold under five other brands.

The primary health concern associated with Cesium-137 is an elevated risk of cancer due to DNA damage from long-term, repeated low-dose exposure. Consumers who have purchased the recalled frozen shrimp are advised not to consume it and to dispose of it or return it to the place of purchase for a full refund, the FDA said.

More packages of frozen shrimp potentially affected by radioactive contamination have been recalled, federal officials said Thursday.