Pneumonic Pasteurellosis

• Synonym: Shipping fever
• Caused by Manheimia haemolytica biotype A serotype 1 (90%) and Pasteurella multocida
• In young, growing cattle
• In clinically normal cattle Mann. haemolytica serotype 2 is present in low numbers, only in nasal cavity and tonsils
• Clinical signs: depression, anorexia, rapid shallow respiration, crusty nose with mucopurulent discharge, serous ocular discharge
• Acute bronchopneumonia and may progress to lobar pneumonia with toxaemia
• Pathology
  • Lobar, cranioventral exudative pneumonia with fibrin, fibrinous pleuritis, areas of coagulative necrosis
• Histology
  • Large numbers of bacteria are usually associated with necrotic lesions