Difference between revisions of "Staphylococcus spp."

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#REDIRECT[[:Category:Staphylococcus species]]
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*Gram positive cocci
 
 
 
 
 
==Staphylococcus hyicus==
 
*Pigs - greasy pig disease
 
*Exudative epidermitis due to ''Staphylococcus hyicus'' is a worldwide problem in piglets. 
 
*The organism can often be isolated from the mucosa and skin of healthy adult pigs, and can persist in the environment for long periods. 
 
*Disease occurs only in young piglets up to about 35 days of age. 
 
*Passive transfer of antibodies from immune sows and development of immunity with age appear to adequately protect against disease. 
 
*Piglets from non-immune sows are predisposed. 
 
*Skin trauma, such as due to fighting, allowing entry of infective organisms is also considered a risk factor in this disease.
 
 
 
===Pathology===
 
[[Image:f00348.jpg]]
 
 
 
===Pathogenesis===
 
*''Staphylococcus hyicus'' produces an exfoliative toxin of approximately 30 kDa that causes separation of cells in the upper stratum spinosum resulting in rapid intraepidermal spread of organisms. 
 
*Death of affected piglets is common and is attributed to dehydration, septicemia, or both. 
 
*This porcine disorder has been likened to “scalded skin syndrome” in human neonates, due to skin infection by exfoliative toxin-producing ''Staphylococcus aureus''.
 
 
 
===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)
 

Latest revision as of 22:55, 14 May 2010