RESUMO
Coenurosis is an important zoonotic helminthic disease caused by the larval stage of the tapeworm Taenia multiceps. This parasite typically infects the brain of the intermediate hosts, including sheep, goat, cattle and even humans. We report a case of T. multiceps infection in a yak confirmed by clinical symptoms, morphological characteristics, and molecular and phylogenetic analyses. The coenurus was thin-walled, whitish, and spherical in shape with a diameter of 10 cm. The parasite species was identified as T. multiceps by PCR amplification and sequencing of the 18S rRNA, cox1 and nad1 genes. Three gene sequences all showed high homology (all above 97%) with the reference sequences from different hosts. Moreover, phylogenetic reconstructions with the 3 published Taenia gene sequences confirmed that the Qinghai yak isolate was closely related to T. multiceps. Although there are advanced diagnosis and treatment methods for coenurosis, early infection is difficult to diagnose. Importantly, the findings of yak infection case should not be ignored due to its zoonotic potential.
Assuntos
Doenças dos Bovinos/parasitologia , Neurocisticercose/veterinária , Taenia/genética , Animais , Bovinos , Ciclo-Oxigenase 1/genética , Eletroforese em Gel de Ágar/veterinária , Masculino , NAD/genética , Neurocisticercose/parasitologia , Filogenia , Reação em Cadeia da Polimerase/veterinária , RNA Ribossômico 18S/genética , Alinhamento de Sequência/veterinária , Análise de Sequência de DNA/veterinária , Taenia/classificação , Taenia/isolamento & purificação , TibetRESUMO
Six cystic metacestodes were found in the abdominal muscles of a wild rabbit, Lepus sinensis, in China. The coenurus contained one or more scolices armed with hooklets. Mitochondrial cox1 (1,623 bp) confirmed 98% homology with cox1 of Taenia serialis. This is the first report of T. serialis infection in an intermediate host in the Qinghai Tibetan Plateau Area, China.