They follow close on the heels of two other outbreaks three days earlier, one in a Perth County farrow-to-finish operation, the other in a Huron County nursery.
These outbreaks bring the total experienced in Ontario to 111 since the first outbreak Jan. 22, 2014, in Middlesex County.
The virus is believed to have come to Canada from the United States, including a number of outbreaks related to blood plasma that Grand Valley Fortifiers of Cambridge incorporated in rations for weaners.
