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Korean J Parasitol. 2018 Jun;56(3):275-280. doi: 10.3347/kjp.2018.56.3.275. Epub 2018 Jun 30.

Genetic and Morphologic Identification of Spirometra ranarum in Myanmar.

Author information

1
Department of Parasitology, Parasite Research Center and Parasite Resource Bank, Chungbuk National University School of Medicine, Cheongju 28644, Korea.
2
Department of Parasitology and Tropical Medicine, Institute of Health Sciences, Gyeongsang National University College of Medicine, Chinju 52727, Korea.
3
Department of Medical Environmental Biology, Chung-Ang University College of Medicine, Seoul 06974, Korea.
4
Department of Parasitology and Tropical Medicine, Seoul National University College of Medicine, Seoul 03080, Korea.

Abstract

In the present study, we identified a Spirometra species of Myanmar origin (plerocercoid) by molecular analysis using mitochondrial cox1 and nad1 genes, as well as by morphological observations of an adult tapeworm. Spargana specimens were collected from a paddy-field in Taik Kyi Township Tarkwa Village, Yangon, Myanmar in December 2017. A total of 5 spargana were obtained from 20 frogs Hoplobatrachus rugulosus; syn: Rana rugulosa (Wiegmann, 1834) or R. tigrina (Steindachner, 1867). The plerocercoids were used for experimental infection of a dog. After 4 weeks of infection, an adult tapeworm was recovered from the intestine of the dog. Morphologically, the distinct features of Spirometra sp. (Myanmar origin) relative to S. erinaceieuropaei and S. decipiens include a uterine morphology comprising posterior uterine coils that larger than the terminal uterine ball and coiling of the uteri diagonally (swirling) rather than spirally. The cox1 sequences (1,566 bp) of the Myanmar-origin Spirometra species showed 97.9% similarity to a reference sequence of S. decipiens (GenBank no. KJ599679) and 90.5% similarity to a reference sequence of S. erinaceieuropaei (GenBank no. KJ599680). Phylogenetic tree topologies were identical and presented high confidence level of values for the 3 major branches of the 3 Spirometra species in cox1 and nad1 genes. These results indicated that Myanmar-origin Spirometra species coincided with those of S. ranarum and may be considered as a valid species.

KEYWORDS:

Myanmar; cox1; molecular detection; nad1; spargana; Spirometra ranarum

PMID:
29996631
PMCID:
PMC6046563
DOI:
10.3347/kjp.2018.56.3.275
[Indexed for MEDLINE]
Free PMC Article

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