title: Investigation of Neospora sp. and Toxoplasma gondii antibodies in mares and in precolostral foals from Parana State, Southern Brazil.
abstract: Antibodies to Neospora sp. and Toxoplasma gondii were measured in mares and precolostral foals from a farm in Parana State, Brazil. An indirect fluorescent antibody test (IFAT) was used to determine specific antibodies. Three sampling points, 2003, 2004 and at parturition were included in the study, but not all horses are represented at a parturition time point. In 2003, antibodies to Neospora were detected in 17 mares (47%) at 1:50 dilution and in 5 mares (13.8%) at 1:100 dilution. In 2004, antibodies to Neospora were found in 11/36 (30%) horses with titers of 1:50 and in 6 mares (16.6%) at 1:100 dilution. The prevalence of antibodies against T. gondii was 2.7% in mares, either in 2003 and 2004. Evidence for the role of Neospora sp. in equine reproduction failure was not observed in the farm. Immunoglobulin G antibodies to Neospora were found in two of the nine precolostrum foals. Four seronegative foals were born from seronegative mothers, and three seronegative foals were born from seropositive mothers (1:50). Two seropositive precolostrum foals were born from seropositive mothers (1:50). The foals were born clinically normal, and T. gondii antibodies were not detected in their serum samples. The total immunoglobulins values detected on seronegative precolostrum foals were lower than the levels observed in the seropositive foals. This data warrants additional studies to differentiate N. hughesi and N. caninum serologically and determination if these parasites were associated with equine neurological disease and reproductive failure.
authors.affiliation: Departamento de Medicina Veterinária, Universidade Federal do Paraná, Rua dos Funcionários 1540, CEP 80035-050, Curitiba, Paraná, Brazil. roslocdi@ufpr.br
authors.forename: R
authors.initials: R
authors.lastname: Locatelli-Dittrich
authors.forename: J R
authors.initials: JR
authors.lastname: Dittrich
authors.forename: R R T B
authors.initials: RR
authors.lastname: Richartz
authors.forename: M E
authors.initials: ME
authors.lastname: Gasino Joineau
authors.forename: J
authors.initials: J
authors.lastname: Antunes
authors.forename: R D
authors.initials: RD
authors.lastname: Pinckney
authors.forename: I
authors.initials: I
authors.lastname: Deconto
authors.forename: D C S
authors.initials: DC
authors.lastname: Hoffmann
authors.forename: V
authors.initials: V
authors.lastname: Thomaz-Soccol
mesh_terms: D000818:Animals; D000831:Animals, Newborn / Q000097:blood* / Q000276:immunology; D000913:Antibodies, Protozoan / Q000097:blood*; D000918:Antibody Specificity; D001938:Brazil; D003048:Coccidiosis / Q000453:epidemiology / Q000469:parasitology / Q000635:transmission / Q000662:veterinary*; D005260:Female; D019084:Fluorescent Antibody Technique, Indirect / Q000379:methods / Q000662:veterinary; D006734:Horse Diseases / Q000453:epidemiology / Q000469:parasitology* / Q000635:transmission; D006736:Horses; D007074:Immunoglobulin G / Q000097:blood; D018445:Infectious Disease Transmission, Vertical / Q000662:veterinary*; D018688:Neospora / Q000276:immunology; D011247:Pregnancy; D016036:Seroepidemiologic Studies; D014122:Toxoplasma / Q000276:immunology; D014124:Toxoplasmosis, Animal / Q000453:epidemiology / Q000469:parasitology* / Q000635:transmission
chemical_list: D000913:Antibodies, Protozoan; D007074:Immunoglobulin G