Health officials are baffled so far, about the source of E-coli contamination this summer in Bruce and Grey Counties.
Eight people have been ill in the last few weeks with the same strain, which is E-coli 157.
That is genetically similar to the E-coli infection in Walkerton that killed seven people and sickened more than two thousand other people.
A few of the infected patients became seriously ill but all are now out of the hospital.
It is not known if any suffer any long term effects.
Program Manager Angela Newman tells Bayshore Broadcasting News they have been investigating several possible sources for the bacteria.
Newman says so far, no connection has been found for the eight patients who suffered from the same strain of E-coli.
They did not swim at the same beach, drink the same water and were not at the same wedding or other event.
The eight patients are also not from one community and are spread out around Grey Bruce with two from outside the area.
Newman says the health unit will continue to look for the cause.
Water and food are the main suspects for E-coli contamination -- but it is a contagious disease so anyone infected needs to wash their hands often.