The CDC announced Thursday that customers should avoid Honey Smacks, tweeting, "Do not eat this cereal."
RELATED: Kellogg's Honey Smacks cereal recalled for possible salmonella
The agency says it found salmonella in samples of Honey Smacks, which has been subject to a voluntary recall by Kellogg since mid-June.
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It says that regardless of expiration date, the cereal should be thrown away or returned to a retailer for a refund.
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The CDC says at least 30 of the people infected in the outbreak have been hospitalized. It says most people infected with salmonella develop a fever, cramps or diarrhea within 12 to 72 hours of being exposed to the bacteria.
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ABC7 News contributed to this report.