At least 30 of the affected people have been hospitalized following the outbreak.
The CDC has urged consumers not to eat Honey Smacks "in any size packaging" and to throw opened or unopened boxes in the trash even if some of the cereal had been eaten without people falling ill.
The statement said salmonella strains had been found in both unopened and leftover samples of Honey Smacks at several locations. The company voluntarily recalled the cereal last month, but the FDA says it's apparently still on grocery shelves and in kitchen cupboards, reports CNN.
Most people recover without treatment, however.
The number of people with salmonella linked to Kellogg's Honey Smacks cereal has grown to 100 across the U.S., prompting the CDC to issue a blunt warning via tweet: "Do not eat this cereal".
"Retailers can not legally offer the cereal for sale and consumers should not purchase Kellogg's Honey Smacks cereal", it wrote.
The CDC puts salmonella illnesses at 1.2 million per year in the United States, 1 million of which are caused by food.
Symptoms for salmonella infection, which lasts about four to seven days, include diarrhoea, fever and abdominal cramps. Thirty people have been hospitalized in this outbreak.
Earlier this year, 210 people were infected by an E. coli outbreak that killed five people linked to romaine lettuce that had been grown in Arizona.
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