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Genotypic characterization of Echinococcus granulosus isolates based on the mitochondrial cytochrome c oxidase 1 (cox1) gene in Northwest Iran.

Hydatidosis is one of the most important zoonotic parasitic diseases caused by the larval stage of Echinococcus granulosus which causes great health and economic losses. The aim of this study was to use the sequencing method to evaluate genotypes of E. granulosus isolated from humans and bovines using mitochondrial cytochrome c oxidase subunit 1 (cox1) gene. The samples were taken in the East Azerbaijan Province, Northwest Iran. Overall, 26 hydatid cyst samples (10 human and 16 cattle isolates) were collected. DNA extraction was taken from the protoscoleces of human and germinal layer of bovine samples. PCR was performed using the mitochondrial cytochrome c oxidase subunit 1(cox1) gene, and then it was sequenced. Sequences were analyzed for identification of their genotypes. All 16 bovine isolates were recognized as G1 genotypes (sheep strain) and G1B subtypes. Out of ten human host samples, seven isolates were G1B subtypes, and three samples were identified as G3 genotypes. The results of this study showed that G1 and especially G1B are the predominant genotype and subtype in humans and cattle in Northwest Iran.