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''' | ||
| + | *Caused by [[Staphylococcus spp.#Staphylococcus hyicus|''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 | ||
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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