title: Sample prevalence and molecular characterisation of Cryptosporidium andersoni within a dairy herd in the United Kingdom.
abstract: Bovine cryptosporidiosis is usually an acute diarrhoeal disease of young calves caused by Cryptosporidium parvum. However, chronic infection with Cryptosporidium andersoni has been associated with gastritis, reduced milk yield and poor weight gain in adult cattle. Here we describe the first genetic confirmation and characterisation of C. andersoni from cattle in the United Kingdom and its sample prevalence within a dairy herd. Oocysts measured 7.5+/-0.4 microm x 5.5+/-0.4 microm (7.0-8.5 microm x 4.5-6.5 microm) with a length-to-width ratio of 1.37 (1.08-1.60). The within-herd sample prevalence was 16% (95% confidence intervals=10.4-21.6%). Nested polymerase chain reaction (PCR)-restriction fragment length polymorphism (RFLP) and sequence analysis of the small subunit rDNA was used to confirm the species and characterise the isolates. Due to the lack of overt, acute, clinical symptoms, the incidence, prevalence and importance of this parasite is probably currently underestimated in cattle in the UK. The potential for zoonotic transmission is unknown.
authors.affiliation: Cryptosporidium Reference Unit, NPHS Microbiology Swansea, Singleton Hospital, Swansea, SA2 8QA, United Kingdom. Guy.Robinson@nphs.wales.nhs.uk
authors.forename: G
authors.initials: G
authors.lastname: Robinson
authors.forename: A L
authors.initials: AL
authors.lastname: Thomas
authors.forename: R G
authors.initials: RG
authors.lastname: Daniel
authors.forename: S J
authors.initials: SJ
authors.lastname: Hadfield
authors.forename: K
authors.initials: K
authors.lastname: Elwin
authors.forename: R M
authors.initials: RM
authors.lastname: Chalmers
mesh_terms: D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000453:epidemiology* / Q000469:parasitology*; D003457:Cryptosporidiosis / Q000453:epidemiology / Q000469:parasitology / Q000662:veterinary*; D003458:Cryptosporidium / Q000145:classification / Q000276:immunology / Q000302:isolation & purification*; D004275:DNA, Ribosomal / Q000032:analysis; D005243:Feces / Q000469:parasitology; D005260:Female; D010802:Phylogeny; D016133:Polymerase Chain Reaction / Q000379:methods / Q000662:veterinary; D012150:Polymorphism, Restriction Fragment Length; D015995:Prevalence; D014852:Wales / Q000453:epidemiology
chemical_list: D004275:DNA, Ribosomal