The Food Standards Agency issued an alert saying that “a large number” of stores were stocking the affected fruit, advising anyone who purchased it to wash their hands and affected surfaces thoroughly.
Customers should be able to identify potentially risky melons with stickers on the fruit, the agency added.
The possible source of several recent cases of salmonella in the UK is believed to be whole honeydew, cantaloupe and galia melons originating in Costa Rica, Honduras or Brazil.
These are likely to have been purchased by buyers on or before May 28, 2021.
The Food Standards Agency said: “If consumers are unsure of the country of origin of their galia, cantaloupe or honeydew melon, they are advised to discard the fruit as a precaution. “
The melons have been withdrawn from sale in stores, the agency added.
Tina Potter, Food Standards Agency incident manager, said: “As a precaution, we do not recommend that people eat these melons and throw them away.
“It is important that consumers wash their hands and all surfaces that have been in contact with melons thoroughly.
“This will help avoid the risk of cross-contamination and the risk of disease. “
Professor Saheer Gharbia, Head of the Gastrointestinal Pathogens Unit at Public Health England, said: “Symptoms of salmonellosis usually resolve on their own and include diarrhea, stomach cramps, nausea, vomiting and fever.
“However, symptoms can be more severe and lead to hospitalization, especially in the very young and those with weakened immune systems.
“Anyone fearing to show symptoms of salmonellosis should contact their general practitioner or department outside of opening hours. “
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Anyone concerned about symptoms should contact their out-of-hours GP or department first.
Only the melons listed above are affected, the agency added.
He said: “We are working with Public Health England, Food Standards Scotland and other UK health protection and food safety colleagues to continue investigations. “