Original Article

Seasonal Prevalence and Novel Multilocus Genotypes of Giardia duodenalis in Yaks (Bos grunniens) in Qinghai Province, Western China

Abstract

Background: Giardia duodenalis is an important opportunistic zoonotic intestinal protozoon, which could parasitize yaks. However, a few studies have been conducted on the seasonal infection of G. duodenalis in yaks in China.

Methods: Overall, 1,027 fecal samples were collected from yaks of two age groups in seven cities of Qinghai Province, China at four seasons between May 2016 and Sep 2017. The prevalence and assemblages were analyzed by nested PCR and multilocus sequence typing (MLST).

Results: The overall prevalence of G. duodenalis was 2.04% (21/1027) based on triose phosphate isomease (tpi) locus. No significant differences in prevalence of the organism in yaks were found among different sampling areas. Additionally, same result was also presented in different seasons. However, there was statistically significant difference between young yaks within 6 months (8.33%, 4/48) and adult yaks over 6 months (1.73%, 17/979). The assemblage A recognized as a zoonotic assemblage (n=3) was found in yaks (>6 months) from Xining, while assemblage E (n=18) was detected from yaks in six cities. There were 5, 2 and 3 G. duodenalis subtypes detected positive at the tpi, the β-giardin (bg), and the glutamate dehydrogenase (gdh) loci, with 2, 2 and 3 novel subtypes, respectively. Three samples were successfully sequenced at all three loci, forming 1 assemblages A multilocus genotype (MLG) and 2 assemblages E MLGs, not reported.

Conclusion: This study indicated a zoonotic potential of G. duodenalis in yaks from Qinghai Province and provides basic information about the epidemiology of G. duodenalis.

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IssueVol 16 No 4 (2021) QRcode
SectionOriginal Article(s)
DOI https://doi.org/10.18502/ijpa.v16i4.7865
Keywords
Giardia duodenalis Multilocus sequence typing (MLST) Yaks Prevalence

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How to Cite
1.
Song J- ke, Wang D, Ren M, Yang F, Wang P-X, Zou M, Zhao G- hui, Lin Q. Seasonal Prevalence and Novel Multilocus Genotypes of Giardia duodenalis in Yaks (Bos grunniens) in Qinghai Province, Western China. Iran J Parasitol. 2021;16(4):548-554.