title: [Isolation and identification of cow-origin Cryptosporidium isolates in Hefei].
abstract: OBJECTIVE
  To isolate cow-origin Cryptosporidium in Hefei, and identify its species.
  
  
  METHODS
  285 dairy cattle fecal samples collected from a farm in Hefei were examined by using floating saturated solution of sucrose and modified acid-fast staining. Cryptosporidium oocysts were isolated and purified from positive fecal samples. Genetic DNA was extracted to be the template. According to the sequence of 18S rRNA gene and HSP70 gene from Cryptosporidium sp., the primers were designed and synthesized. The PCR products were amplified by PCR and nested-PCR. The nested PCR products were cloned and sequenced. Homology searches and phylogenic tree construction were done by DNAStar software.
  
  
  RESULTS
  Five fecal samples were positive by morphological methods with an infection rate of 1.8% (5/285). Oocysts from the 5 positive fecal samples were elliptical or ovoid detected by using floating saturated solution of sucrose and modified acid-fast staining with the size of 7.37 microm x 6.13 microm and 7.58 microm x 6.20 microm, and a shape index of 1.20 and 1.22, respectively. Nested-PCR resulted in a 18S rRNA and HSP70 gene fragments with approximately 250 bp and 325 bp, respectively. The five isolates showed a high level of nucleic acid identity with sequence data of the 18S rRNA gene of Cryptosporidium andersoni (DQ989573), and they were clustered in the same clade. The highest HSP70 gene sequence identity was found among the five isolates and other reported C. andersoni isolates (AY954892 and DQ989576), and they were placed into the same clade.
  
  
  CONCLUSIONS
  The cow-origin Cryptosporidium isolates derived from Hefei is Cryptosporidium andersoni.
authors.forename: Tao
authors.initials: T
authors.lastname: Sun
authors.forename: Wei
authors.initials: W
authors.lastname: Liu
authors.forename: Ju-Hua
authors.initials: JH
authors.lastname: Wang
authors.forename: Xiu-Heng
authors.initials: XH
authors.lastname: Xue
authors.forename: Chang-Cheng
authors.initials: CC
authors.lastname: Zhao
authors.forename: Pei-Ying
authors.initials: PY
authors.lastname: Li
mesh_terms: D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000469:parasitology*; D002681:China; D003457:Cryptosporidiosis / Q000469:parasitology / Q000662:veterinary*; D003458:Cryptosporidium / Q000235:genetics* / Q000302:isolation & purification*; D005243:Feces / Q000469:parasitology; D005260:Female; D018840:HSP70 Heat-Shock Proteins / Q000235:genetics; D010270:Parasite Egg Count; D010802:Phylogeny; D012337:RNA, Ribosomal, 18S / Q000235:genetics
chemical_list: D018840:HSP70 Heat-Shock Proteins; D012337:RNA, Ribosomal, 18S