The E. coli outbreak in Germany is a new form of the bacterium, researchers and public health experts believe.
The infection can cause the deadly complication - haemolytic-uraemic syndrome (HUS) - affecting the blood and kidneys.
More than 1,500 people have been infected and 18 have died: 17 in Germany and one in Sweden.
In the UK, three British nationals have been infected - all had visited Germany.
The World Health Organisation said the variant had "never been seen in an outbreak situation before."
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