title: Phylogenetic relationships among isolates of Cryptosporidium: evidence for several new species.
abstract: Isolates of Cryptosporidium were characterized using nucleotide sequence analysis of the 18S rRNA and dihydrofolate reductase genes and also random-amplified polymorphic DNA analysis. Phylogenetic analysis confirmed the validity of the species of Cryptosporidium examined in this study such as Cryptospordium muris and Cryptosporidium baileyi, and also reinforced evidence from numerous researchers worldwide suggesting that Cryptosporidium parvum is not a single uniform species. The data obtained provided strong support for the validity of Cryptosporidium felis. Evidence suggests that the newly identified marsupial and pig genotypes may also be distinct and valid species, but biological studies are required for confirmation.
authors.affiliation: World Health Organisation Collaborating Centre for the Molecular Epidemiology of Parasitic Infections, Division of Veterinary and Biomedical Sciences, Murdoch University, WA, Australia.
authors.forename: U M
authors.initials: UM
authors.lastname: Morgan
authors.forename: P T
authors.initials: PT
authors.lastname: Monis
authors.forename: R
authors.initials: R
authors.lastname: Fayer
authors.forename: P
authors.initials: P
authors.lastname: Deplazes
authors.forename: R C
authors.initials: RC
authors.lastname: Thompson
mesh_terms: D000818:Animals; D002415:Cats; D002417:Cattle; D003458:Cryptosporidium / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification; D005838:Genotype; D006801:Humans; D008394:Marsupialia; D051379:Mice; D008969:Molecular Sequence Data; D010270:Parasite Egg Count; D010802:Phylogeny; D015800:Protozoan Proteins / Q000737:chemistry / Q000235:genetics; D012337:RNA, Ribosomal, 18S / Q000235:genetics; D019105:Random Amplified Polymorphic DNA Technique; D013552:Swine; D013762:Tetrahydrofolate Dehydrogenase / Q000235:genetics
chemical_list: D015800:Protozoan Proteins; D012337:RNA, Ribosomal, 18S; D013762:Tetrahydrofolate Dehydrogenase