|
|
| (40 intermediate revisions by 5 users not shown) |
| Line 1: |
Line 1: |
| − | <big><center>[[Infectious agents and parasites|'''BACK TO INFECTIOUS AGENTS AND PARASITES''']]</center></big>
| + | #REDIRECT[[:Category:Staphylococcus species]] |
| − | <big><center>[[Bacteria|'''BACK TO BACTERIA''']]</center></big>
| |
| − | | |
| − | *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)
| |