They think the strain originated in Egypt and is now being spread across Europe by contaminated fruit, vegetables and spices.
So far at least 200 Britons have been infected with the bug know as Salmonella Kentucky since 2000.
Super bug: Scientists think the new strain of
Salmonella originated in Egypt and is now being spread across Europe by
contaminated fruit, vegetables and spices
Figures show that the number of Britons infected with this particular type has trebled over the last decade.
In 2000 less than 20 cases were reported to the Health Protection Agency but this had gone up to 60 in 2008, the most recently available figures. It is not known if anyone has died from this strain.
There are around 2,500 different types of salmonella bacteria across the world lurking in soil or in the intestines or animals.
Most people catch the bug by eating infected chicken or eggs but it can also be spread by fruit or vegetables that has been contaminated in the soil
It isn’t normally serious and symptoms include vomiting, diarrhoea, headaches and fever clear up without treatment within a few days.
Food poisoning: Most people catch salmonella by eating infected chicken, eggs or red meat
Scientists from the Institut Pasteur at the World Health Organisation in Paris, France say that this particular type is resistant to all types of drugs.
They are concerned it could spread very quickly around the world – and could prove deadly for the most vulnerable.
The scientists, whose study is published in the Journal of Infectious Disease, looked at the number of reported cases in England and Wales, France, Denmark and the USA between 2002 and 2008.
They discovered that in all countries the number of cases had increased substantially.
The scientists think that the strain originated in Egypt in the 1990s and has since spread to other African countries such as Morocco and Ethiopia through infected poultry.
They think it is now being spread across Europe through contaminated spices, fruit or vegetables imported from Africa.
Dr Le Hello, lead researcher said: "We hope that this publication might stir awareness among national and international health, food, and agricultural authorities so that they take the necessary measures to control and stop the dissemination of this strain before it spreads globally”.
Most people catch salmonella by eating infected chicken, eggs or red meat.
But it can also be caught by eating fruit and vegetables that has been contaminated by the bug in the soil.
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