title: Letter to the editor.
authors.affiliation: Veterinary Diagnostic and Production Animal Medicine, College of Veterinary Medicine, Iowa State University, Ames, IA.
authors.forename: Annette M
authors.initials: AM
authors.lastname: O'Connor
mesh_terms: D000818:Animals; D002418:Cattle Diseases / Q000469:parasitology*; D003627:Data Interpretation, Statistical; D005260:Female; D011529:Protozoan Infections, Animal / Q000453:epidemiology*