Story highlights A random sample from a Michigan store tested positive for Listeria monocytogenes

No illnesses caused by the hummus have been reported so far

(CNN) Sabra Dipping Co. is recalling 30,000 cases of hummus due to possible contamination with Listeria, the U.S. Food and Drug Administration said Wednesday.

The nationwide recall is voluntary. So far, no illnesses caused by the hummus have been reported.

The potential for contamination was discovered when a routine, random sample collected at a Michigan store on March 30 tested positive for Listeria monocytogenes.

. Anyone who has purchased any of the items is urged to dispose of or return it to the store for a full refund. The FDA issued a list of the products in the recall Anyone who has purchased any of the items is urged to dispose of or return it to the store for a full refund.