A case report of sporadic ovine listerial meningoencephalitis in Kosovo.

In 2018, a case of neural disease suspected of listeriosis was reported in a flock of sheep in Kosovo with the death of ewes and 5 lambs. Samples from the brain of only three dead animals were subjected to histopathological and bacteriological analysis. MALDI-TOF MS was applied to confirm suspected Listeria spp. isolates from culture and multiplex PCR was applied for molecular serotyping. All isolates were tested for antimicrobial susceptibility by microdilution broth method. The histopathological analysis of the brain specimens showed typical changes for Listeria monocytogenes. Listeria spp. was isolated in brain samples from all three animals, and all the isolates were confirmed using MALDI-TOF MS and PCR down to the species level (Listeria monocytogenes). The molecular characterisation using multiplex PCR revealed all isolates as Listeria monocytogenes serotype 4b. All L. monocytogenes isolates were found to be susceptible to penicillin, erythromycin, tetracycline, streptomycin, trimethoprim/sulfamethosazole, quinupristin/dalfopristin, kanamycin, vancomycin, and gentamicin but resistant to nitrofurantoin and lincomycin. This study shows the emergence of a highly virulent strain in sheep farms in Kosovo and a possible threat to public health.