More than two months after declaring the outbreak over, the U.S. Centers for Disease Control and Prevention said an additional 43people have been sickened by strains of salmonella linked to Foster Farms poultry.

The new cases were reported between late February and March 18, bringing the total number of people sickened by the year-old national outbreak to 524.

The outbreak first surfaced last October when the U.S. Department of Agriculture issued a health alert warning consumers of salmonella linked to three Foster Farms processing facilities in Central California.

Inspectors threatened to suspend operations at the plants after discovering poor sanitary conditions that could have contributed to the outbreak.

Foster Farms, which is headquartered 25 miles southeast of Modesto in the rural community of Livingston, never issued a recall. Costco and Kroger Co. pulled some Foster Farms products from their stores.

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