We were advised this morning by Andrew Morrison of the Ontario Ministry of Health that a link between the Niagara and Michigan/Illinois outbreaks of E. coli O157:H7 has not been established. Here is what we know:
- The Chatham-Kent outbreak definitely was linked to the Michigan/Illinois outbreak.
- Preliminary genetic fingerprinting of some isolates from the North Bay outbreak showed a connection between the North Bay and Chatham-Kent strains. This was not borne out by more extensive testing.
- One isolate from the Halton outbreak appears to be the same as the Niagara outbreak strain.
- The Niagara cases have not been linked to the Michigan/Illinois outbreak strain.
Our thanks to Andrew Morrison for this clarification.
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