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The Scientific World Journal
Volume 2014, Article ID 480732, 10 pages
http://dx.doi.org/10.1155/2014/480732
Research Article

The Effectiveness of Anti-R. equi Hyperimmune Plasma against R. equi Challenge in Thoroughbred Arabian Foals of Mares Vaccinated with R. equi Vaccine

1Department of Microbiology, Faculty of Veterinary Medicine, University of Selcuk, 42075 Konya, Turkey
2Program of Food Technology, Sarayonu Vocational School, University of Selcuk, 42075 Konya, Turkey
3Department of Pathology, Faculty of Veterinary Medicine, University of Selcuk, 42075 Konya, Turkey
4Department of Internal Medicine, Faculty of Veterinary Medicine, University of Selcuk, 42075 Konya, Turkey

Received 3 December 2013; Accepted 5 March 2014; Published 3 April 2014

Academic Editors: T. Betakova, V. Fedorenko, Y. Mu, Z. Shi, and H. Zaraket

Copyright © 2014 Osman Erganis et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This study aimed to determine the effectiveness of a pregnant mare immunization of a Rhodococcus equi (R. equi) vaccine candidate containing a water-based nanoparticle mineral oil adjuvanted (Montanide IMS 3012) inactive bacterin and virulence-associated protein A (VapA), as well as the administration of anti-R. equi hyperimmune (HI) plasma against R. equi challenge in the mares’ foals. The efficacy of passive immunizations (colostral passive immunity by mare vaccination and artificial passive immunity by HI plasma administration) was evaluated based on clinical signs, complete blood count, blood gas analysis, serological response (ELISA), interleukin-4 (IL-4) and interferon gamma (IFN-γ), total cell count of the bronchoalveolar lavage fluids (BALF) samples, reisolation rate of R. equi from BALF samples (CFU/mL), lung samples (CFU/gr), and lesion scores of the organs and tissue according to pathological findings after necropsy in the foals. The vaccination of pregnant mares and HI plasma administration in the foals reduced the severity of R. equi pneumonia and lesion scores of the organs and tissue by 3.54-fold compared to the control foals. This study thus indicates that immunization of pregnant mares with R. equi vaccine candidate and administration of HI plasma in mares’ foals effectively protect foals against R. equi challenge.