Lettuce shipped to Alberta part of Listeria recall

Nearly 2,500 cartons of California lettuce, some of which was shipped to Alberta, is being recalled after a random sample tested positive for Listeria.

The recalled product was shipped between Sept. 12 and 13 to a wholesale food distributor in Oregon. All the bags have "use by" date of Sept. 29.

The chopped and shredded romaine lettuce was then shipped to several other U.S. states and to Alberta, said True Leaf Farms in a statement on the U.S. Food and Drug Administration’s website.

There have been no reported illnesses.

Listeria can cause listeriosis, a serious but rare illness. Listeriosis usually manifests as mild flu-like illness and symptoms can include vomiting, nausea, cramps, severe headache, constipation or fever.

The affected product was only available for direct consumer purchase at some stores in Oregon, Washington and Idaho, the  California-based company said.

Produce affected by the recall was labeled as:

• 2# bags, chopped romaine — bag and box code B256-46438-8.

FDA officials said the contamination was discovered when a sample was taken as part of a random check.