Morphological and molecular discrimination of fasciola species isolated from domestic ruminants of urmia city, iran.

  • Mohammad Yakhchali Dept. of Pathobiology, Faculty of Veterinary Medicine, Urmia University, Urmia, Iran.
  • Reza Malekzadeh-Viayeh Lake Urmia Research Institute, Urmia University, Urmia, Iran.
  • Abbas Imani-Baran Dept. of Pathobiology, Faculty of Veterinary Medicine, Tabriz University, Tabriz, Iran.
  • Karim Mardani Dept. of Food Hygiene and Quality, Faculty of Veterinary Medicine, Urmia University, Urmia, Iran.
Keywords: 28SrRNA gene, Liver flukes, Morphology, PCR-sequencing, RFLP


 Background: The trematodes of the genus Fasciola (the liver flukes) are among the well-known instances of food-borne parasites worldwide. Differentiation of Fasciola species is important because of their different transmission and epidemio-logical characteristics. The current study was undertaken to discriminate Fasciola species in the domestic ruminants of Urmia city, Iran. Methods:Adult flukes were isolated from the naturally infected livers of the slaughtered water buffaloes and sheep. The flukes were initially identified based on morphological and morphometric parameters. A 618-bp-long fragment of the 28SrRNA gene of Fasciola was amplified by polymerase chain reaction (PCR). The amplified fragment was digested by DraII or AvaII enzymes for a restriction frag-ment length polymorphism (RFLP) analysis and sequenced for the phylogenetic tree construction.Results:Based on the morphometric examination, the flukes belonged to F. he-patica, F. gigantica and an intermediate Fasciola form. The PCR-RFLP analysis was able to differentiate F. hepatica from F. gigantica. While the phylogenetic reconstruc-tion justified, to some extent, the morphological diagnosis, it failed to segregate F. hepatica from F. gigantica identified in this and the previous studies.Conclusion:To resolve fully the problem of taxonomy and evolution in Fasciola species, employing a broad range of molecular and morphological approaches is necessary. This is crucial for epidemiological surveys and successful clinical man-agement of their infection.


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How to Cite
Yakhchali M, Malekzadeh-Viayeh R, Imani-Baran A, Mardani K. Morphological and molecular discrimination of fasciola species isolated from domestic ruminants of urmia city, iran. Iran J Parasitol. 10(1):46-55.