When we had our cases and we did our notification through CIOSC, that meant my fellow CMOHs across the country would be checking their cases as well to see if they had an increased number of listeriosis cases. That's one aspect. When we identify that through the hypothesis generation and agreement around that period of August 18 and August 19, they said they had closed packages from the plant. Therefore a product had gone out that we understood went to our institutions in Ontario. Of course we didn't know whether it went to institutions beyond Ontario, and certainly it was confirmed to us that this was the case. Therefore, on the federal level the Public Health Agency of Canada added that to the alerts, and so did the health hazard alert, which is a national one, along with the company that would alert them to that effect.
On May 27th, 2009. See this statement in context.