A voluntary recall of romaine lettuce is being conducted across 19 states because of concerns about potential E.coli contamination. 

Tanimura & Antle, based in Salinas, California says it's voluntarily recalling the lettuce. 

The company says the recall concerns its Field Fresh Wrapped Single Head Romaine. 

Cases were sent to Alabama, Arkansas, Arizona, California, Georgia, Kansas, Kentucky, Maryland, North Carolina, New Mexico, Nevada, New York, New Jersey, Pennsylvania, South Carolina, Tennessee, Texas, Virginia and Washington. 

The product was also shipped to Canada and Puerto Rico.