Sky News 
June 2, 2011
The E.coli which has struck down four more people in the UK after killing 17 across Europe is a new strain which has not been seen before, experts say.
Early investigations suggest the strain is a mutant form of two different E.coli bacteria and appears to be more virulent than other strains.
“This E.coli is a new strain of bacteria that is highly infectious and toxic,” scientists at the Beijing Genomics Institute in China, who are working with teams in Germany, said.
Hilde Kruse, a food safety expert at the World Health Organisation, added: “This is a unique strain that has never been isolated from patients before.”