intra-nasally (IN) 15 days post challenge (DPC) by snaring
the pigs and administering half the inoculum into each
nostril using a 6 ml disposable syringe. At 39 DPC, a third
booster with 10 ml of 1010 CCU/ml M. hyosynoviae (using
the same strain they were initially challenged with) was
administered IN.