Maywood, Calif.-based Caldwell Fresh Foods has issued a voluntary nationwide recall of all alfalfa sprout products, which have been linked to a salmonella outbreak in 10 states: Arizona, California, Colorado, Idaho, Illinois, Missouri, New Mexico, Nevada, Oregon and Wisconsin.

Of the 22 confirmed patients, six have been hospitalized. No deaths have been reported.

Sprouts were sold under three brand names:

1. Caldwell Fresh Foods
2. Nature’s Choice
3. California Exotics

The sprouts were distributed to a variety of restaurants, delicatessens and retailers, including Trader Joe’s and Wal-Mart stores. Some outbreak patients reported eating sprouts at restaurants; others purchased them at retail outlets.

Consumers and restaurant/delicatessen operators should immediately stop using the affected products.

Caldwell’s other products, including organic selections like cole slaw mix, carrots, onions, celery and stir-fry blends, are not affected by this recall.

The U.S. Food and Drug Administration (FDA) is investigating the outbreak in cooperation with the Centers for Disease Control and Prevention (CDC), California Department of Public Health and public health agencies in other affected states. Scientists are now inspecting the firm’s facility and collecting samples.