A severe inflammation of the lungs (pneumonia) commonly seen in North American cattle after experiencing the stress of transport. This disease occurs mainly in 6–9-month-old beef calves transported to feedlots. Many infectious agents, both viruses and bacteria, cause symptoms of respiratory disease in stressed cattle. However, the characteristic shipping fever pneumonia is caused primarily by the bacteria Mannheimia (formerly Pasteurella) haemolytica serotype A1 and, to a lesser extent, Pasteurella multocida; thus a synonym for shipping fever is bovine pneumonic pasteurellosis.