Figure 1
From: Laboratory-based evaluation of legionellosis epidemiology in Ontario, Canada, 1978 to 2006
Average Rates of Legionellosis by Ontario Health Region, 1990 to 2006. Rates are per 100,000 persons per year, and are presented from 1990 forward due to difficulties in regional population estimation prior to that time. Note that only the southernmost extreme of the North Ontario Health Region is included on the map; this region is geographically larger than all other health regions combined, but has a far lower population density. Map scale 1 cm = 32 kilometers (1 inch = 52 miles).