Over the past number weeks approximately 10 cull sow transports have been turned around at the Canada US border because vesicles have been found.
Although foreign animal disease testing has ruled out Foot and Mouth Disease, samples have tested positive for Seneca Valley Virus.
Dr Egan Brockhoff, the Veterinary Counsel with the Canadian Pork Council, says it appears Seneca Valley Virus doesn't move aggressively and among naive animals it doesn't appear to express itself in a very severe manner.