A California infant has died and at least 10 other people have been sickened in an outbreak of listeria food poisoning linked to ready-to-eat meat and poultry products that include chicken feet, duck necks, beef shanks and pork knuckles, federal health officials reported Friday.

Yu Shang Food, Inc. in Spartanburg, South Carolina, has recalled more than 72,000 pounds of meat and poultry products linked to the outbreak, according to the U.S. Department of Agriculture. Some products were originally recalled on November 9.

The food was shipped to stores across the country and available online, and illnesses have been reported in four states. The problem was discovered in October after routine tests detected listeria in food and the production environment.

RELATED STORY | Boar’s Head listeria outbreak declared over after 10 deaths

Of the 11 people who have fallen ill, nine have been hospitalized, according to the US Centers for Disease Control. Interviews with people who were sick and laboratory findings pointed to the Yu Shang Food products.

Even if the foods have been recalled, some may still be in consumers’ refrigerators or freezers. The products must be discarded or returned to the place of purchase. Refrigerators, containers and other surfaces that may have touched the food must be cleaned and disinfected.

People get sick from listeria poisoning when they eat food contaminated with the bacteria. Symptoms can be mild and include fever, muscle aches, nausea, vomiting and diarrhea. More serious ailments can include headache, stiff neck, confusion, loss of balance and convulsions.

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

Another listeria outbreak linked to recalled Boar’s Head deli meat has ended, CDC officials said this week. That outbreak killed 10 people this summer and sickened dozens more.

RELATED STORY | USDA launches internal investigation into deadly Boar’s Head outbreak