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Comparison of weekly counts of reportable cases for (A) all bacteria (Salmonella, Campylobacter, Escherichia coli, Yersinia, Shigella) (January 2001 to April 2004), (b) Norovirus, (C) Rotavirus and (D) all parasites (Giardia, Crytosporidium, Entamoeba) (April 2001 to April 2004) in a Canadian province. Dotted areas represent approximate winter periods
