Staphylococcus aureus okozta folliculitis és furunculosis sertésben Esetismertetés és elkülönítő kórjelzés

Abstract

Summary Background: Dermal lesions in pigs are quite infrequent in comparison to com panion animals. Some pigs with unusual disseminated papular lesions have been recently submitted to the Diagnostic Laboratory of the Department and Clinic for Production Animals. During diagnostic workup, the authors have extracted some further, previously unreported cases from their archives with similar dermal pat terns. These are used now to illustrate the differential diagnosis of Staphylococcus aureus induced folliculitis and furunculosis. Objectives: Two to three-week-old piglets in a high health status breeding herd developed disseminated nodular dermal lesions. These were from a batch of pig lets weaned at 2 days of age, and reared artificially. Skin lesions were not associa ted with further clinical signs or with mortality, so the three weakest piglets were sacrificed for diagnostic purposes. Other affected piglets recovered after cephalos porine therapy. Materials and Methods: Dissection, histopathological examination of the skin and major organs was performed, along with attempts to detect porcine circovirus 2 (PCV-2), porcine parvovirus (PPV) by polymerase chain reaction (PCR). Aerobic bacte riological examination of dermal lesions was performed. Carriage of methicillin-re sistance genes was assessed also with PCR. Results and Discussion: Diagnostic examination of the skin revealed up to 5 mm diameter raised nodules, some with central ulceration. All other organs were free of alterations. Typical nodules were follicles distended with neutrophil granulocytes, in some of the nodules inflammation involved also the follicular wall and the surround ing dermis. Cocci were seen scattered in inflammatory infiltrates. Aerobic bacterio logical examination of dermal lesions revealed Staphylococcus aureus in pure culture. None of the detected strains harboured mecA/mecC gene. Folliculitis and furunculosis caused by Staphylococcus aureus is quite rare in pigs, but occurs with some frequency in other domestic species. Differential diagnostics of dis seminated nodular dermal lesions in pigs include swine pox, chronic exudative der matitis, hypersensitivity form of mange, granulomatous dermatitis, and demodicosis.