Pasteurellosis is a zoonotic disease caused by infection with bacteria of the Pasteurella genus. Pasteurella sp., P.skyensis, and P.atlantica are Gram-negative, rod-shaped facultatively anaerobic bacteria and an increasingly emerging threat for farmed Norwegian salmon. Despite its implications and impact on fish stocks, little is known about this infectious agent. The Pasteurella genus consists of several species that infect animals including fish, horses, pigs, hamsters, cats and dogs.