A lab technician prepares a bacteria culture with a sample of stool taken from a patient possibly suffering from enterohemorrhagic E. coli, also known as the EHEC bacteria, at the University Medical Center Hamburg-Eppendorf on June 2, 2011 in Hamburg, Germany.
Health officials remain baffled about the source of E. coli contamination this summer in the southwestern Ontario Grey and Bruce Counties.
Eight people have fallen ill in the last few weeks with the same E. coli strain that killed seven people and sickened hundreds in Walkerton, Ont., 11 years ago.
A few of those eight patients became seriously ill, but all are now out of the hospital and recovering at home.
Health unit spokeswoman Angela Newman says they are investigating several possible sources of the bacteria, but no connection has been found for the eight patients.
The eight patients are also not from one community and are spread out around Grey-Bruce with two from outside the area.
Water and food are the main suspects for E. coli contamination, but it can be passed from person to person.