Prevalence of Neospora caninum infection in dogs from beef-cattle farms, dairy farms, and from urban areas of Argentina

Prevalence of anti-Neospora caninum antibodies was determined in sera of 32 0 dogs from Argentina using the indirect fluorescent antibody test (IFAT). Antibodies to N. caninum were found in 121 of 320 (37.8%) sera with titers of 1:50 (21 dogs), 1:100 (23 dogs), 1:200 (23 dogs), 1:400 (17 dogs), 1:800 (23 dogs), and greater than or equal to1:1,600 (14 dogs). The seropositivi ty (IFAT 1:50) was higher in dogs from dairy (48% of 125) and beef (54.2% o f 35) farms than in dogs from urban areas (26.2% of 160). Prevalence of ant i-N. caninum antibodies was higher in dogs more than 12 mo of age (47.7%, 1 05 of 222) versus in 12-mo-old or younger dogs (12.7% of 86), suggesting po stnatal exposure of N. caninum infection in dogs.