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.
It says that regardless of expiration date, the cereal should be thrown away or returned to a retailer for a refund.
RELATED: Parasite outbreak linked to McDonald's salads in Illinois, Iowa
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.
ABC7 News contributed to this report.