A sign hangs outside the Kellogg's factory near Manchester, Britain March 7, 2016.
The CDC warned customers, saying "Do not eat this cereal".
The FDA is sending out this reminder because it has learned some retailers are still selling the cereal. At least 30 of the 100 people have been hospitalized; no deaths have been reported, the CDC said. "All Honey Smacks cereal was recalled in June 2018. The FDA will continue to monitor this situation closely and follow up with retailers as we become aware of recalled products being offered for sale".More news: Ruthless Federer marches on in Wimbledon title defence
Public health officials have renewed their advice to consumers who have eaten of handled the recalled Honey Smacks to seek medical attention if they develop symptoms of Salmonella infection immediately.
The sugary puffed wheat cereal has been the subject of a recall by Kellogg's since mid-June.
The cereal is the likely source of the salmonella outbreak, the CDC said. However, the FDA is asking that consumers avoid purchasing or consuming any Honey Smacks cereal for the time being - regardless of the dates on the box - out of an abundance of caution. Florida has two people sick.
Symptoms last about four to seven days, and although most people improve without treatment, some may require hospitalization because of severe diarrhea. "No deaths have been reported", the agency reported on its website.