Walkerton Tragedy: 10 years of research leads to breakthrough

Montreal - McGill Studies of the victims of the Walkerton, Ont. tainted drinking water tragedy have led researchers to discover DNA variations in genes that increase the risk of developing post-infectious irritable bowel syndrome (PI-IBS). The sheer scale of infection and the recording of the health of Walkerton"s citizens gave a team of researchers a unique opportunity to study the origin of this disorder. "Although the exact cause of PI-IBS remains unknown, we now know for the first time that, in addition to the environmental trigger, genetic factors are also playing a critical role in the development of this disease," explains McGill PhD Alexandra-Chloé Villani, who led the team under the direction of principal investigators John K. Marshall (McMaster) and Denis Franchimont (formerly of McGill). Stephen Collins (McMaster) also collaborated. Almost 10 years ago, the municipal water supply of Walkerton was contaminated with E. coli and Campylobacter jejuni, leading to a public health disaster. Seven people died and 2,300 suffered symptoms, including bloody diarrhea.