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On the incidence of swine erysipelas based on slaughterhouse experiences

On the incidence of swine erysipelas based on slaughterhouse experiences

Magyar Allatorvosok Lapja 48(2): 83-89

Erysipelothrix rhusiopathiae bacteria were isolated in 338 to 29 529 pigs (1.1%) at the slaughterhouse of Pecs during an 18 years period (1974-1991). 60.6% of the isolates originated from ordinary, 36/1% from emergency slaughtered pigs while 3.3% of cases were sent for laboratory investigation from the region. Yearly fluctuation of erysipelas cases observed during ordinary and emergency slaughtering was also studied. It was found that erysipelas cases during emergency slaughtering - due to the decreased number of slaughtered pigs - did not reflect the incidence of E. rhusiopathiae in the swine population. However, in case of ordinary slaughtering, the highest incidence of swine erysipelas cases - showing a significant fluctuation - was found in 1975 (0.00113%) and 1991 (0.0091%). Studying the monthly fluctuation of swine erysipelas was observed that after a peak in June and September, it culminated in December. Incidence of different courses of diseases and spreading of E. rhusiopathiae in the organism was studied in case of 231 erysipelas diseased pigs. Erysipelas septicaemia was observed in 7.4%, urticaria in 52.4%, endocarditis in 8.5%, chronic arthritis in 27.2% while other forms (vertebral necrosis, abscesses) in 4.3% E. rhusiopathiae were isolated from two organs in 42% of the 231 erysipelas affected pigs. Of the investigated organs, the most frequently infected were, as follows: kidneys (46.3%), praescapular lymph node (36.8%) and the organs with pathological alterations (skin, joint, endocardium 51.9%). It has been pointed out that swine erysipelas can not be considered a completely solved problem from the point of view of meat inspection.

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