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Giardia duodenalis  is a common and widespread intestinal protozoan parasite of both humans and animals. Previous epidemiological and molecular studies have identified  Giardia  infections in different animals and humans, but only limited information is available about the occurrence and genotypes of  Giardia  in cattle in China. In this study, we determined the occurrence of giardiasis and genetically characterized  G. duodenalis  in dairy cattle in Henan Province, central China. The overall prevalence of  G. duodenalis  was 7.2% (128/1777) on microscopic analysis, with the highest infection rate (22.7%) in calves aged less than 1 month.  G. duodenalis  assemblages and subtypes were identified with multilocus genotyping based on the SSU rRNA, β-giardin ( bg ), glutamate dehydrogenase ( gdh ), and triosephosphate isomerase ( tpi ) genes. Two assemblages were detected in the successfully sequenced samples: assemblage A (n = 58), assemblage E (n = 21), with a mixed E and A assemblage (n = 2). Four novel subtypes of the  gdh  gene and seven of the  bg  gene were found among the  G. duodenalis  assemblage E isolates. Using the nomenclature for the multilocus genotype (MLG) model, nine novel multilocus genotypes E (MLGs E1–E9) and three MLGs A (a novel subtype AI, previously detected subtype AII-1, and a combination of both) were identified. MLG AII-1 identified in this study may be an important zoonotic subtype. The dairy cattle in Henan are a potential public health concern.

Multilocus Genotyping of Giardia duodenalis in Dairy Cattle in Henan, China