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Geographic distribution of phylogenetic clusters II and I/III from 1990 through 2007. Rates are cases of infection with Legionella pneumophilia serogroup 1 clones per 100,000 persons per year. The province of Ontario was divided into 7 health regions (OHRs) with populations ranging from ≈0.5 to 2 million persons: Toronto, South West (SW), Central South (CS), Central West (CW), Central East (CE), East, and North.
