title: Neospora caninum and Hammondia heydorni are separate species/organisms.
abstract: Neospora caninum and Hammondia heydorni are two coccidian parasites with morphologically similar oocysts in canine feces. It was recently proposed that they are one species. In this paper, we review the biology and morphology of these parasites and present evidence that N. caninum and H. heydorni are separate species.
authors.affiliation: Parasite Biology, Epidemiology and Systematics Laboratory, Animal and Natural Resources Institute, Agriculture Research Service, United States Dept of Agriculture, Building 1001, Beltsville, MD 20705-2350, USA. jdubey@anri.barc.usda.gov
authors.forename: J P
authors.initials: JP
authors.lastname: Dubey
authors.forename: Dolores E
authors.initials: DE
authors.lastname: Hill
authors.forename: David S
authors.initials: DS
authors.lastname: Lindsay
authors.forename: Mark C
authors.initials: MC
authors.lastname: Jenkins
authors.forename: Arvid
authors.initials: A
authors.lastname: Uggla
authors.forename: Clarence A
authors.initials: CA
authors.lastname: Speer
mesh_terms: D000818:Animals; D002415:Cats; D003048:Coccidiosis / Q000469:parasitology / Q000662:veterinary*; D004283:Dog Diseases / Q000469:parasitology*; D004285:Dogs; D021741:Eimeriida / Q000145:classification* / Q000235:genetics / Q000648:ultrastructure; D005243:Feces / Q000469:parasitology; D006790:Host-Parasite Interactions; D018688:Neospora / Q000145:classification* / Q000235:genetics / Q000648:ultrastructure; D010802:Phylogeny; D016133:Polymerase Chain Reaction; D014122:Toxoplasma / Q000145:classification* / Q000235:genetics / Q000648:ultrastructure