Abstract
The transplacental transmission is the primary route of Neospora caninum infection in bovine herds around the world. This study aimed to determine the frequency of transplacental transmission of the parasite in dairy cattle of Agreste region of Pernambuco through serological tests (IFAT and ELISA). Three hundred sixteen serum samples from cows and heifers and their offspring were analyzed. The transplacental transmission rate was 72.22% (13/18) for cows and 69.23% (9/13) for heifers by IFAT. ELISA test showed transplacental transmission rate of 43.58% (17/39) for cows and 50% (9/18) for heifers. The transplacental transmission rates were similar, in both groups in test, but a higher seropositivity was found in cows by IFAT. Data were statistically analyzed using the chi-square and Fisher's exact test. A significant relationship of dependence between seropositivity of mothers and their offspring was found. The more frequent IFAT antibody titers and ELISA levels for N. caninum were, respectively, 200 and between four (cows) and five (heifers and offspring). In the Spearman correlation, no association was found between the magnitude of antibody titers for N. caninum between mothers and their offspring. The kappa test showed an index of 0.35, indicating a mild correlation between the serological tests used. The study suggests that cows and heifers are the main transmitters of N. caninum in the studied region and that vertical transmission is the major form of transmission in dairy herds of the Agreste region of Pernambuco.
Highlights
RIFI e posicionados entre o nível quatro e cinco pelo Enzyme-Linked Immunosorbent Assay (ELISA)
Transplacental transmission of N. caninum can be estimated from the number of seropositive offspring born from seropositive mothers, soon after their birth and before ingestion of colostrum (PARÉ et al, 1996).Among the techniques used to show whether neosporosis is involved as a disease with in the reproductive sphere, the Indirect Fluorescente Antibody Test (IFAT) and Enzyme-Linked Immunosorbent Assay (ELISA) are the major serological tests used in the routine (PARÉ et al, 1996; JENKINS et al, 2002)
The present study aimed to evaluate the frequency of transplacental transmission of N. caninum between dairy cattle and their respective offspring before ingestion of colostrum, in the Agreste region of Pernambuco, by serological techniques
Summary
RIFI e posicionados entre o nível quatro (vacas) e cinco (novilhas e bezerros) pelo ELISA. The present study aimed to evaluate the frequency of transplacental transmission of N. caninum between dairy cattle (cows and heifers) and their respective offspring before ingestion of colostrum, in the Agreste region of Pernambuco, by serological techniques.
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