Calif. lettuce grower River Ranch Fresh Foods recalls bagged salads after finding Listeria

lettuce recall, listeria, river ranch
A label from one of the recalled bags of lettuce grown by River Ranch Fresh Foods.

(CBS/AP) California lettuce grower, River Ranch Fresh Foods, has expanded its voluntary recall of some bagged salads to the entire country, after routine sampling detected contamination with Listeria monocytogenes bacteria. No illnesses have been reported, the company said.

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The voluntary recall by the Salinas, Calif.-based grower initially included lettuce shipped to California and Colorado. The bagged salads are sold under the names River Ranch, Farm Stand, Hy-Vee, Marketside, Shurfresh, The Farmer's Market, Cross Valley, Fresh n Easy, Promark and Sysco.

The recalled retail and food service salad bags have "best by" dates between May 12 and May 29 or Julian dates of 118 and 125. The code date is typically located in the upper right hand corner of the bags.

A full list of recalled retail salad bags can be found here, and a full list of recalled food service bags can be accessed here.

Consumers with questions can contact River Ranch 24-hours per day at 1-800-762-7708.

Symptoms of Listeria infection, or listeriosis, include high fever, diarrhea, headache, convulsions and neck stiffness. Older adults, pregnant women, and people with a weakened immune system are considered high-risk for the infection. Unlike many pathogens, Listeria monocytogenes bacteria can grow at room temperatures or refrigerator temperatures, and can linger long after the source of the contamination is gone.

Last year, cantaloupes grown in Holly, Colo. caused a Listeria outbreak that killed 30 people and caused one woman to have a miscarriage. The nearly five-month outbreak sickened 146 people across 28 states, HealthPopreported.

The CDC has more on Listeria infection.