Figure 2

Observed and Model-Predicted Legionellosis Rates by Culture Confirmation in Ontario from 1978 to 2006. Bars represent observed rates of disease (black bars = overall rates; white bars = rates of disease without culture confirmation; gray bars = rates of disease with culture confirmation). Lines represent fitted regression model with spline knots occurring at approximately decade-long intervals. All rates associated with statistically significant decline since 1998.