BOSTON -- Possible listeria contamination has prompted Stop & Shop to recall some pre-packaged tuna salad, the grocery chain announced Monday.

Stop & Shop said 12-ounce pre-packaged containers and tuna salad sold at the service deli could be contaminated with listeria monocytogenes.

The following products are affected by this recall:

12 oz. Pre-packaged Stop & Shop Tuna Salad
UPC #0-688267-06663
Sell-by-date: Aug. 19, 2008

Stop & Shop Tuna Salad (Service Deli)
UPC #20880380000
Sell-by-dates: July 28, 2008 through Aug. 19, 2008

Stop & Shop said it has not received any reports of illnesses associated with eating the salad.

Listeria monocytogenes is a bacteria that can cause flu-like symptoms, including high fever, severe headache, neck stiffness and nausea. Although healthy people rarely contract listeriosis, it can be very serious for those who are pregnant, those with weakened immune systems, such as infants, the elderly and persons with HIV infection, or those who are undergoing chemotherapy.

Customers who purchased the affected products should discard any unused portions or bring their purchase receipt to Stop & Shop for a full refund.

Consumers may also call Stop & Shop Customer Service at 800-767-7772 Monday through Friday from 9 a.m. to 5 p.m.