A Northern California produce supplier said Sunday it is voluntarily recalling romaine lettuce that was shipped to 19 states, Puerto Rico and Canada over fears about possible E. coli contamination.
 
Salinas-based Tanimura & Antle said the recall is limited to a single lot of its Field Fresh Wrapped Single Head Romaine that was available at retail stores starting Aug. 2. The lettuce is packed in a plastic bag with the UPC number 0-27918-20314-9, and it may have a "best by" date of Aug. 19.
 
Pennsylvania is among the states receiving the potentially affected lettuce
 
The recall was being conducted in consultation with Food and Drug Administration, and was based on the testing of a random sample by the Canadian Food Inspection Agency. There have been no reported illnesses associated with consumption of this product.