Figure 1.

Trends in the submission-level prevalence of Salmonella enterica isolated from environmental samples submitted through the Ontario Hatchery and Supply Flock Policy between 2009 and 2018, by major poultry commodities. Broiler breeders (n = 2446 submissions); Layer breeders (n = 1848 submissions); and Turkey breeders (n = 3715 submissions). A submission was considered S. enterica-positive if at least one sample tested positive for S. enterica, regardless of the number of serovars isolated from the sample, and S. enterica-negative if none of the samples tested positive for S. enterica.