(a) Time series of the monthly number of C. jejuni cases in the region of Waterloo (Ontario) from May 2005 to December 2010, and of the monthly prevalence of C. jejuni in the potential sources, i.e. retail chicken (median monthly number of samples =16, min = 6 and max = 39) and water (median monthly number of samples =10, min = 2 and max = 20), over the same period and in the same geographical area. (b) Time series of the monthly number of C. jejuni cases in the region of Waterloo (Ontario) from May 2005 to December 2010, and of the monthly frequency among all cases of enteric disease of risk behaviours linked to the potential sources, i.e. barbequing and swimming in natural waters, over the same period and in the same geographical area.