In June of 2007, a ruptured vesicle, rounded with necrotic edges that were blue-grey, was noted on the snout
of a pig from a trailer load of 187 Canadian market hogs that arrived at a harvest facility in Minnesota from Manitoba. Further investigation of these pigs identified 12 animals that had red coalescing erosions on the snout. Another 25% to 30% of the pigs had broken vesicles along the coronary band that were swollen and blanched white, with tissues separating from the edge of the hoof and dewclaws sloughing from their attachments. Testing identified the presence of porcine circovirus and porcine enterovirus. Unfortunately, little is known about the causation
of idiopathic vesicular disease, outbreaks of which occur sporadically.