A CDC statement Thursday advised consumers not to eat any of the cereal regardless of package size or "best by" date.
The agency says it found salmonella in samples of Honey Smacks, which has been subject to a voluntary recall by Kellogg since mid-June.
"Fifty-five (85 percent) of 65 people interviewed reported eating cold cereal".
So far people from 33 states have been affected.
According to Reuters, the company recalled an estimated 1.3 million cases of the cereal but the US Food and Drug Administration (FDA) said Thursday that it believes the cereal is still being sold by some stores.
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Additionally, if you stored the tainted cereal in any kind of a reusable container you'll need to wash and sanitize that container before you use it again.
The cereal is the likely source of the salmonella outbreak, the CDC said.
"Ill people range in age from less than one year to 95, with a median age of 57".
In addition to finding the outbreak strain in the manufacturing plant and in unopened packages of Honey Smacks collected from consumers' homes, public health officials have confirmed the outbreak strain in unopened packages of the cereal collected from a retailer's shelves in California. "No deaths have been reported", the agency reported on its website. At least 30 of the 100 people have been hospitalized; no deaths have been reported, the CDC said. Pennsylvania (8), MA (7), and California (6) have the most cases, but illnesses are widespread and affecting all ages.
People infected with Salmonella may have symptoms including diarrhea, fever, and abdominal cramps. The illness usually lasts 4 to 7 days, and most people recover without treatment.