Systemic Bacterial Infections

• Salmonellosis
  • Capillary dilatation and congestion -> cyanosis of external ears and abdoman
  • Thrombosis -> necrosis of extremities
• Erysipelas in pigs
  • Caused by Erysipelothrix rhusiopathiae
  • Vasculitis, thrombosis, ischaemia -> cutaneous lesions - firm, raises, rhomboidal pink to dark purple areas
• Clostridium novyi
  • Severe cellulitis, toxaemia and death of young rams during breeding season (due to traumatised heads) - 'big head'
• Streptococcus equi
  • In horses
  • Immune complex vasculitis -> purpura