In June of 2003 caseous lymphadenitis (CL) was diagnosed in a commercial small scale sheep flock in Borsod-Abaúj-Zemplén County (in Northern Hungary). The morbidity rate was 9.5%, because 10 of 105 ewes (2-5 years old) showed clinical symptoms. The other animals, including 2 breeding rams and 28 weaned lambs, in the flock were symptomless. The parotid, retropharyngeal or submandibular lymph nodes were mostly affected (Figures 1, 2, 3). Thick, greyish-green or pale yellowish-green, odourless, purulentnecrotic exudate (Figure 4) were aseptically obtained from the incised lymph nodes for conventional bacteriological examination. The isolated Corynebacterium strains (Figures 5, 6 and 7) were catalase- and urease-positive, fermentative in the OF test. They failed to reduce nitrate, did not liquefy gelatin, produced acid from glucose, but not from mannitol, salicin and trehalose. All isolated strains were toxigenic, because they inhibited the staphylococcal β-haemolysin in the reverse CAMP test (Figure 8). Based upon these characteristics all isolates were identified as nitrate-negative ("ovine/caprine") biotype of Corynebacterium psedotuberculosis. 7 of 10 isolated strains were also characterised by API Coryne System (bioMérieux) and all 7 strains were identified as C. psedotuberculosis (Table). These strains were sensitive to penicillin, erythromycin, doxycycline, Oxytetracycline, cefotaxime, rifampicin and sulfamethoxazol-trimethoprim, but resistant to streptomycin. Surgical, antiseptic and local and parenteral Oxytetracycline treatment of affected lymph nodes was apparently effective, because some weeks later only one relapse could be observed. During the 18 months movement restriction period two new cases of CL were recognized and bacteriologically verified in the flock. These animals were effectively treated in the same manner. According to a questioner survey (in which 50 veterinarians participated), suspected cases of CL were recognized only in three sheep flocks (less than 1.0% of registrated flocks) in Borsod-Abaúj-Zemplén County. This county is the fourth most important sheep-raising area of Hungary. Based upon the data in the literature, the authors emphasized that C. psedotuberculosis is able to cause axillary or inguinal lymphadenitis in humans and the majority of reported human cases were occupational zoonoses.
|Number of pages||9|
|Journal||Magyar Allatorvosok Lapja|
|Publication status||Published - Dec 1 2005|
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