Systematic Veterinary Bacteriology and Mycology

PATHOGENICITY

• Horse: Botryomycosis: Infrequent chronic granulomatous lesions involving the udder of the mare, cow and sow and the spermatic cord of horses.
• Cattle: Mastitis: Staphylococcal bovine mastitis may be chronic, acute and peracute. Gangrenous mastitis due to a toxin is seen in postparturient cows.
• Sheep: Tick pyemia in lambs occurs in 2-5 week old lambs, which is heavily infected with Ixodes ricinus.
• Periorbital eczema is an infection due to abrasions, Staphylococcal dermatitis due to scratches from vegetation.
• Poultry
  • Bumble foot: A pyogranulomatous process of subcutaneous tissue of foot that can involve the joints.

  

  • Staphylococcal arthritis and septicemia in turkeys, omphalitis – yolk sac infection, wing rot or gangrenous dermatitis infection in poultry
• Pig: Exudative epidermitis (greasy pig disease) is an acute generalized infection of suckling and weaned pigs caused by S. hyicus. This disease is characterized by excess sebaceous secretion, exfoliation and exudation.
• Dogs and Cats: Pyoderma is one of the most common skin diseases of dogs.
• In addition to this, Otittis externa and other suppurative conditions are caused by S. intermedius.
• Staphylococcal antigens produce intense inflammatory reaction and promote persistence of the bacteria.
• Other Staphylococcal organisms
  • S. aureus sub sp.anaerobius causes caseous lymphadenitis. They are anaerobic and catalase negative.
  • S. caprae in goat’s milk.
  • S. gallinarum and S. arlettae - skin of chickens
  • S. lentus in skin of sheep and goats.
  • S. equorum in skin of horses
  • S. simulans and S. felis - clinical specimens in cats
  • S. delphini in skin of dolphins
  • S. aureus in Staphylococcal scalded skin syndrome (SSSS) and Toxic shock syndrome (TSS) in humans.
  • MRSA in Methicillin resistant Staphylococcus aureus