SAN FRANCISCO -- Costco's South San Francisco store on early Saturday morning recalled nearly 40,000 pounds of cooked chicken linked to a salmonella outbreak that has sickened more than 300 people nationwide.

The Agricultural Department announced the store's recall of 9,000 rotisserie Foster Farms chickens and related Kirkland Farms products such as soup, chicken salad and leg quarters purchased at the South San Francisco store from Sept. 11 to Sept. 23.

Costco officials couldn't be reached Saturday. A recorded message warns customers to discard or return any leftovers of the Foster Farms chicken products.

Most of the chicken implicated in an outbreak that is still ongoing has been purchased raw by consumers. The Costco chicken implicated in the outbreak is cooked on the store's premise and sold as "ready to eat."

Sampling by the USDA in September linked raw chicken processed by three Foster Farms processing plants in Central California to the outbreak. The Centers for Disease Control and Prevention said the plants in Fresno and Livingston are the "likely source" of the "Heidelberg" salmonella strain rarely found in the United States.

The outbreak started in March and continues to sicken people. The CDC said 42 percent of victims were hospitalized, about double the normal rate.

The particular strain of salmonella in the outbreak is resistant to many antibiotics, making it more dangerous.

The CDC reported Friday that 317 people in 20 states and Puerto Rico have been stricken by the tainted chicken. About 230 of the victims live in California, the CDC reported.

No deaths have been reported.

Salmonella can contaminate meat during slaughter and processing and is especially common in raw chicken. The infections can be avoided by proper handling and cooking of poultry.