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To study the presence of  Giardia duodenalis  in Xinjiang, northwest China, we collected 801 fecal specimens from seven large-scale pig farms and screened them using PCR targeting the SSU rRNA gene. Twenty-one (2.6%) of the specimens from five farms were  G. duodenalis- positive, with a significant difference in prevalence among different farms (0–8.7%) ( p  < 0.01).  Giardia duodenalis  prevalence was highest in fattening pigs (5.4%, 7/129), followed by sows (3.2%, 7/222), post-weaning piglets (1.8%, 5/281), and pre-weaning piglets (1.2%, 2/169), but there was no significant difference in prevalence among the age groups ( p  > 0.05). Sequence analysis of the SSU rRNA gene revealed that the 21  G. duodenalis  strains belonged to three assemblages: A ( n  = 2), B ( n  = 16), and E ( n  = 3). Assemblage B was the predominant assemblage and was widely distributed in all  G. duodenalis -positive farms and age groups. All  G. duodenalis -positive specimens were further assayed at the β-giardin ( bg ), glutamate dehydrogenase ( gdh ), and triosephosphate isomerase ( tpi ) genes, and two  tpi , four  gdh,  and two  bg  sequences were identified. These data indicate that pigs may be a zoonotic risk and can potentially spread  G. duodenalis  infection from animals to humans.

Detection and genetic characterization of Giardia duodenalis in pigs from large-scale farms in Xinjiang, China