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The foods were shipped to retail locations nationwide and available online, and illnesses have been reported in four states. The problem was discovered in October after routine tests detected listeria in the foods and the production environment.

Of the 11 people sickened, nine were hospitalized, the U.S. Centers for Disease Control said. A California woman who was pregnant with twins was sickened and both infants died, the CDC said, but listeria was only found in a sample from one of the infants, so that child and the mother were included in the count but the other infant wasn't.

Interviews with people who were sickened and laboratory findings pointed to the Yu Shang Food products.

Although the foods have been recalled, some may still be in consumers' refrigerators or freezers. The products should be discarded or returned to the place of purchase. Refrigerators, containers and other surfaces that may have touched the foods should be cleaned and sanitized.

when they eat foods contaminated with the bacteria. Symptoms can be mild and include fever, muscle aches, nausea, vomiting and diarrhea. More serious illness can include headache, stiff neck, confusion, loss of balance and convulsions.

Listeria poisoning is tricky, because symptoms can start quickly, within a few hours or days after eating contaminated food. But they also can take weeks or up to three months to show up. Those most vulnerable to getting sick include the very young, people older than 65 and those with weakened immune systems or who are pregnant.

A different listeria outbreak tied to recalled Boar’s Head deli meats . That outbreak killed 10 people this summer and sickened dozens of others.

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The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Science and Educational Media Group. The AP is solely responsible for all content.