Occurrence: Worldwide, some herds free
Age affected: Piglets pre-weaning, weaners (all ages)
Causes: Strains of a bacterium, Pasteurella multocida, which produce a powerful toxin, the dermonecrotoxin. Poor ventilation and overcrowding increase its effects.
Effects: Sneezing, snuffling, nasal discharge in piglets, with tear staining and followed by twisting/shortening of the snout, poor growth.