Health experts are investigating a multistate outbreak of E. coli that has infected dozens of people, according to the Centers for Disease Control and Prevention.
Thirty-eight people were infected in 20 states, including California, New York, Massachusetts, Maryland, Virginia, Texas, Illinois and Pennsylvania.
Ten of those infected have been hospitalized, and no deaths have been reported, the CDC said.
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According to health experts, the source of the outbreak was flour produced from the General Mills facility in Kansas City, Missouri.
On May 31, the company recalled about 10 million pounds of flour from the affected states.
The brands affected are Gold Medal flour, Wondra flour and Signature Kitchens flour sold in Safeway, Albertsons, Jewel, Shaws, Vons, United, Randalls and Acme.
General Mills said Tuesday that E. coli wasn't been found in any of its flour products, but was still carrying out the recall out of "an abundance of caution."
"While attempting to track the cause of the illness, CDC found that approximately half of the individuals reported making something homemade with flour at some point prior to becoming ill," according to the company's statement.
Some of those who became ill may have also consumed raw dough or batter, the company said.
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