Preliminary findings indicate that cases began at the beginning of May and are continuing to occur. Twenty-five suspect cases, including 15 deaths, were identified by the team. Samples were collected and transported to NIV where diagnostic laboratory tests will be performed to establish the aetiology of the outbreak. Training in barrier nursing will be provided to medical and nursing staff. On 21 May, the Public Health Unit issued a 'Boil Water Order' to the residents of Walkerton which is still in effect.
Investigations are under way by provincial and federal health and environmental authorities.