Bacterial skin infections - Pathology

Cutaneous bacterial infections tend to be called pyodermas. They are superficial, deep and are common in dogs, but less common in other species.

Bacterial Pododermatitis

• Digital infections in ruminants
• Contagious Footrot

• Necrobacillosis of the foot

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