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Giardia duodenalis  is an important zoonotic pathogen for both human and animal health. Although there have been reports on  G. duodenalis  infections in animals all over the world, information regarding the prevalence and genetic characteristics of  G. duodenalis  in sheep in Inner Mongolia, China, is limited. In this study, 209 sheep fecal specimens were collected in this autonomous region. We established that the prevalence of  G. duodenalis  was 64.11% (134/209), as determined using nested PCR detection and sequences analysis of the small subunit ribosomal RNA ( SSU rRNA ) gene. Based on the beta-giardin ( bg ) locus, the glutamate dehydrogenase ( gdh ) locus, and the triose phosphate isomerase ( tpi ) locus to study genetic characteristics, both assemblages A (2.99%, 4/134) and E (97.01%, 130/134) were found. Five novel nucleotide sequence of assemblage E were detected, two at the  bg  locus, two at the  gdh  locus, and one at the  tpi  locus. Multilocus genotyping yielded four assemblage E and two assemblage A multilocus genotypes (MLGs), including four novel assemblage E MLGs and one novel assemblage A MLG. Results of this study indicated that  G. duodenalis  was highly prevalent in sheep in Inner Mongolia. This study is the first to use the multilocus genotyping approach to identify  G. duodenalis  in sheep from this region.

Genetic characteristics of Giardia duodenalis from sheep in Inner Mongolia, China