title: Molecular prevalence of Cryptosporidium spp. in dairy calves in Southern states of India.
abstract: Dung samples were collected from dairy calves of south Indian states viz., Andhra Pradesh, Karnataka, Kerala, Tamil Nadu and union territory, Puducherry and are subjected to nested polymerase chain reaction (PCR) targeting 18S rRNA gene for detection of Cryptosporidium infection. Of the 459 dung samples screened 182 were found positive with a prevalence of 39.65%. Highest prevalence of Cryptosporidium was observed in Puducherry (86.67%) and lowest in Kerala (17.65%). Genotyping by PCR-restriction fragment length polymorphism (RFLP) and sequence analysis revealed the presence of all the four major Cryptosporidium species of cattle viz., Cryptosporidium andersoni, Cryptosporidium ryanae, Cryptosporidium parvum and Cryptosporidium bovis. C. andersoni was widely distributed in calves of Tamil Nadu, Karnataka and Puducherry whereas in Andhra Pradesh C. ryanae was the major species. Of the 64 samples subjected to PCR-RFLP, 39 (60.94%) could be classified as C. andersoni, 18 (28.13%) as C. ryanae, 4 (6.25%) as C. parvum and 3 (4.69%) were confirmed as C. bovis. The results were also confirmed by sequencing of 19 Cryptosporidium DNA samples.
authors.affiliation: Department of Veterinary Parasitology, Madras Veterinary College, Chennai 600 007, Tamil Nadu, India. venuparas2001@yahoo.com
authors.forename: R
authors.initials: R
authors.lastname: Venu
authors.forename: B R
authors.initials: BR
authors.lastname: Latha
authors.forename: S Abdul
authors.initials: SA
authors.lastname: Basith
authors.forename: G Dhinakar
authors.initials: GD
authors.lastname: Raj
authors.forename: C
authors.initials: C
authors.lastname: Sreekumar
authors.forename: M
authors.initials: M
authors.lastname: Raman
mesh_terms: D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000453:epidemiology / Q000469:parasitology*; D003457:Cryptosporidiosis / Q000453:epidemiology / Q000469:parasitology / Q000662:veterinary*; D003458:Cryptosporidium / Q000235:genetics* / Q000302:isolation & purification; D003612:Dairying; D005243:Feces / Q000469:parasitology; D007194:India / Q000453:epidemiology; D017720:Molecular Epidemiology; D010802:Phylogeny; D016133:Polymerase Chain Reaction / Q000379:methods / Q000662:veterinary; D015995:Prevalence