Morphological and molecular characterization of Eurytrema cladorchis parasitizing cattle (Bos indicus) in Bangladesh

Parasitology Research
Uday Kumar MohantaTadashi Itagaki

Abstract

There is always controversy regarding identification of different species in the genus Eurytrema. Identification has been based mainly on morphology, which can be misleading and subject to differing interpretation among the scientists. Therefore, the aim of this study was to identify Eurytrema flukes both by morphology and molecular properties on the basis of 18-subunit ribosomal RNA (18S rRNA) gene as well as internal transcribed spacer 2 (ITS2) to clarify their phylogenetic status. Among six different agroecological areas of Bangladesh, 22 Eurytrema flukes were recovered from the bile ducts of 22 cattle in Bandarban, a hill district. The flukes were identified as Eurytrema cladorchis through morphometric and morphological studies. Phylogenetic analyses were conducted by neighbor-joining phylogram inferred from both 18S rRNA (1784 bp) gene and ITS2 (229 bp) sequences. A monophyletic clade was constructed by the E. cladorchis from Bangladesh; however, the clade was distinct from those formed by Eurytrema pancreaticum and Eurytrema coelomaticum. This study first described the existence of E. cladorchis from Bangladesh and may provide useful information for both morphological and molecular properties that may further help to clar...Continue Reading

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