Figure 6.

Number of herds reporting onset of clinical problems due to PCVAD in Ontario between 2004 and 2008 according to three case definitions. Case definition 1 was based on the producer's recall of a clinical outbreak of PCVAD, case definition 2 was based on the producer's recall of a clinical outbreak of PCVAD and of diagnostic confirmation from the laboratory, and case definition 3 was based on the producer's recall of a clinical outbreak of PCVAD and of diagnostic confirmation from the laboratory and of observation of excessive weight loss in a large number of animals. Note that herds without geographical coordinates were included in this figure, increasing the number of case herds to 179.