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Licensed Unlicensed Requires Authentication Published by De Gruyter March 25, 2015

Seroepidemiological study of Neospora caninum in beef and dairy cattle in La Pampa, Argentina

Marcelo Fort, Martyn Edelsten, Stephen Maley and Elisabeth Innes
From the journal Acta Parasitologica

Abstract

Neospora caninum is considered one of the major causes of abortion in cattle. The aim of this study was to examine and quantify the extent of the infection in cattle in a representative region of Argentina (La Pampa, province). An average sample size of 36 sera per herd was selected from 97 beef and 24 dairy herds. A total of 4334 serum samples were tested for specific anti- Neospora caninum IgG using an indirect-ELISA and 302 seropositive-ELISA sera were re-examined using an Avidity-ELISA procedure for N.caninum. The overall estimated seroprevalence for N.caninun was 9.6% (95%CI: 8.7%; 10.5%). Levels of seroprevalence were significantly different in beef 7.0% and dairy 20.3% cattle. Disease distribution seems to be associated with climatic conditions as well as the management system. Cows in the east and central regions were at a 4.5-fold and 2.0-fold higher risk, respectively, of being N. caninum seropositive compared with cows in west region. Levels of recent infection were evaluated through an avidity ELISA in seropositive animals, being registered a 0.56% and a 1.71% of recent infection in beef and dairy cattle respectively (p = 0.006). The results revealed that dairy cows had 3.1(95%CI: 1.4; 7.0) higher risk of contracting Neoporosis through horizontal transmission than beef cows. A relationship between Brucella abortus and N. caninum seroprevalence was also observed. The risk of being N. caninum seropositive was two times higher where Brucellosis seroprevalence was >3.5%. These results reveal the distribution of N. caninum infection in the cattle population in La Pampa, Argentina

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Received: 2014-7-25
Revised: 2014-12-20
Accepted: 2014-12-31
Published Online: 2015-3-25
Published in Print: 2015-6-1

© 2015 W. Stefański Institute of Parasitology, PAS