The U.S. Food and Drug Administration (FDA) is publicly advising everyone not to eat any deli-prepared tuna salad bought between July 26 and August 10 because they may be contaminated with Listeria. The bacterium was found in 5000 pounds of tuna salad after routine sampling. Any product dated after August 10 is safe to eat, according to The Department of Public Health.

Listeria causes flu-like symptoms such as nausea, fever and headache. It can be fatal to the old people, to newborns and to people with weakened immune systems. It can also cause miscarriages.

The advice is referring to the products manufactured by Home Made Brand Foods in Newburyport. The two affected products are the 12 oz. prepackaged Stop & Shop Tuna Salad with a sell-by date of Aug. 19, and Stop & Shop Tuna Salad from the service deli with a sell-by date between July 28 and Aug. 19. The company said the tuna salad was distributed to stores in Massachusetts, Rhode Island, Connecticut, Maine, New Hampshire and New Jersey.

No cases of infections have been reported yet, company officials said.

Due to fear of contamination, Stop & Shop has announced a voluntary recall of its tuna salad. All shops have removed all containers of the product. Buyers can return the products and will receive a complete refund.

Home Made Brand Foods was purchased last May by the Irish company Greencore for $44 million. It has about 200 employees. The company also produces pizza, dips, sandwiches, pies or soups.