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Cryptosporidium  spp. and  Giardia duodenalis  are common gastrointestinal parasites with a broad range of hosts, including humans, livestock, and wildlife. To examine the infection status and assess the zoonotic potential of  Cryptosporidium  spp. and  G. duodenalis  in dairy cattle in Gansu, China, a total of 1414 fecal samples were collected from the rectum, with one sample collected from each individual animal. All the samples were tested using nested PCR based on the small subunit ribosomal RNA ( SSU  rRNA) gene of  Cryptosporidium  spp. and  G. duodenalis . The overall infection rates of  Cryptosporidium  spp. and  Giardia duodenalis  were 4.2% ( n  = 59) and 1.0% ( n  = 14), respectively. Four  Cryptosporidium  species were identified:  C. andersoni  ( n  = 42),  C. parvum  ( n  = 12),  C. bovis  ( n  = 5), and  C. ryanae  ( n  = 1). In further analyses of subtypes of  C. parvum  isolates based on the 60 kDa glycoprotein ( gp60 ) gene, five were successfully subtyped as IIdA19G1 ( n  = 4) and IIdA15G1 ( n  = 1). All 14  G. duodenalis  isolates were identified as assemblage E using the triosephosphate isomerase ( tpi ) gene. The relatively low positive rates of  Cryptosporidium  spp. and  G. duodenalis  detected here and the predominance of non-human pathogenic species/assemblages of these parasites indicated their unique transmission dynamics in this area and the low level of threat posed to public health. However, continuous monitoring and further studies of these parasites should be conducted for the prevention and control of these pathogens.

Prevalence and molecular characterization of Cryptosporidium spp. and Giardia duodenalis in dairy cattle in Gansu, northwest China