Difference between revisions of "Staphylococcus hyicus"

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(Created page with '===Exudative epidermitis (Greasy pig disease)=== *Worldwide disease of pigs under 3 months of age caused by ''S. hyi…')
 
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**Dermatosis vegetans (associated with a giant cell pneumonia)
 
**Dermatosis vegetans (associated with a giant cell pneumonia)
 
**Dermatophytosis (most commonly ''Microsporum nanum'')
 
**Dermatophytosis (most commonly ''Microsporum nanum'')
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* = '''Exudative epidermitis of pigs'''
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*Caused by [[Staphylococcus spp.#Staphylococcus hyicus|''Staphylococcus hyicus'']]
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*Affects neonatal piglets - often fatal, older piglets - milder disease
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*Focal erosion of stratum corneum
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*Brown exudate
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*Dermatitis around eyes, ears, snout, chin and medial legs, may spread to ventral abdomen and thorax
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*Rapidly becomes generalised -> greasy exudate over red skin -> hardened, cracked exudate
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*In older piglets, milder localised disease develops around eyes, ears and face
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*Grossly:
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**Thickened epidermis, scaling
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*Microscopically:
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**Early - subcorneal pustular dermatitis extending to hair follicles -> superficial suppurative folliculitis
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**Late - hyperplastic epidermis, thick keratin crusts with cocci, microabscesses
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 +
 
[[Category:Staphylococcus_species]][[Category:Pig]]
 
[[Category:Staphylococcus_species]][[Category:Pig]]

Revision as of 23:07, 14 May 2010

Exudative epidermitis (Greasy pig disease)

  • Worldwide disease of pigs under 3 months of age caused by S. hyicus
  • Highly contagious and persists in the environment for long periods
  • S. hyicus produces exfoliative toxin that causes separation of cells in stratum spinosum resulting in rapid intraepidermal spread of organisms
  • Similar to “scalded skin syndrome” in human neonates, due to skin infection by exfoliative toxin-producing Staphylococcus aureus
  • Excessive sebacious secretion and exudation on surface of skin
  • Pigs are anorexic, febrile, depressed and have a greasy, non-pruritic dermatitis
  • SKin thickened, wrinkled and scaley
  • Acute death in piglets under 3 weeks due to dehydration and septicaemia
  • 20-100% morbidity; up to 90% mortality
  • Organism enters skin via abrasions e.g. bite wounds
  • Carried in vaginal mucosa and skin of sows
  • Predisposed by lack of milk, weaning and other infections
  • Piglets from non-immune sows are predisposed
  • Passive transfer of antibodies from immune sows and development of immunity with age protect against disease
  • Isolation from skin lesions
  • Early systemic antibiotics amd topical antiseptics/antibiotics useful
  • Disinfection after outbreak
  • Wash sows before farrowing
  • Differential diagnosis:
    • Mange (Sarcoptes scabiei var. suis)
    • Swine parakeratosis (zinc and essential fatty acid deficiency)
    • Porcine juvenile pustular psoriasiform dermatitis (collarettes or rings typically on the ventrum of young pigs)
    • Dermatosis vegetans (associated with a giant cell pneumonia)
    • Dermatophytosis (most commonly Microsporum nanum)


  • = Exudative epidermitis of pigs
  • Caused by Staphylococcus hyicus
  • Affects neonatal piglets - often fatal, older piglets - milder disease
  • Focal erosion of stratum corneum
  • Brown exudate
  • Dermatitis around eyes, ears, snout, chin and medial legs, may spread to ventral abdomen and thorax
  • Rapidly becomes generalised -> greasy exudate over red skin -> hardened, cracked exudate
  • In older piglets, milder localised disease develops around eyes, ears and face
  • Grossly:
    • Thickened epidermis, scaling
  • Microscopically:
    • Early - subcorneal pustular dermatitis extending to hair follicles -> superficial suppurative folliculitis
    • Late - hyperplastic epidermis, thick keratin crusts with cocci, microabscesses