10/03/2011 02:52 EDT | Updated 12/03/2011 05:12 EST

Calif. farm says lettuce recall covers 19 states, Canada; no illnesses reported

SALINAS, Calif. - A California farm that issued a voluntary lettuce recall over listeria contamination concerns says its notice has gone out to 19 states and Canada.

A spokeswoman at the Canadian Food Inspection Agency said Monday that the lettuce imported to Canada was distributed to food service companies in Edmonton and Calgary by Northern Lights Produce.

True Leaf Farms of Salinas initially announced a recall of 90 cartons of romaine lettuce shipped to Oregon, Idaho and Washington.

But the chief executive of Church Brothers, which sells and markets the farm's produce, clarified Saturday that the recall involves nearly 2,500 cartons.

CEO Steve Church says most cartons went to institutions such as restaurants and cafeterias, which were notified about the recall. He says only 90 cartons went to retail sales, and those were the ones mentioned in the initial announcement.

The company issued the recall after a random check by federal officials found a sample tested positive for listeria. No illnesses were reported.