The efficacy of alcelaphine herpesvirus-1 (AlHV-1) immunization with the adjuvants Emulsigen® and the monomeric TLR5 ligand FliC in zebu cattle against AlHV-1 malignant catarrhal fever induced by experimental virus challenge

Lankester, F. et al. (2016) The efficacy of alcelaphine herpesvirus-1 (AlHV-1) immunization with the adjuvants Emulsigen® and the monomeric TLR5 ligand FliC in zebu cattle against AlHV-1 malignant catarrhal fever induced by experimental virus challenge. Veterinary Microbiology, 195, pp. 144-153. (doi:10.1016/j.vetmic.2016.09.019) (PMID:27771060) (PMCID:PMC5081063)

[img]
Preview
Text
130962.pdf - Published Version
Available under License Creative Commons Attribution.

651kB

Abstract

Malignant catarrhal fever (MCF) is a fatal disease of cattle that, in East Africa, follows contact with wildebeest excreting alcelaphine herpesvirus 1 (AlHV-1). Recently an attenuated vaccine (atAlHV-1) was tested under experimental challenge on Friesian-Holstein (FH) cattle and gave a vaccine efficacy (VE) of approximately 90%. However testing under field conditions on an East African breed, the shorthorn zebu cross (SZC), gave a VE of 56% suggesting that FH and SZC cattle may respond differently to the vaccine. To investigate, a challenge trial was carried out using SZC. Additionally three adjuvant combinations were tested: (i) Emulsigen1, (ii) bacterial flagellin (FliC) and (iii) Emulsigen1 + bacterial flagellin. We report 100% seroconversion in all immunized cattle. The group inoculated with atAlHV-1 + Emulsigen1 had significantly higher antibody titres than groups inoculated with FliC, the smallest number of animals that became infected and the fewest fatalities, suggesting this was the most effective combination. A larger study is required to more accurately determine the protective effect of this regime in SZC. There was an apparent inhibition of the antibody response in cattle inoculated with atAlHV-1 + FliC, suggesting FliC might induce an immune suppressive mechanism. The VE in SZC (50–60%) was less than that in FH (80– 90%). We speculate that this might be due to increased risk of disease in vaccinated SZC (suggesting that the vaccine may be less effective at stimulating an appropriate immune response in this breed) and/or increased survival in unvaccinated SZC (suggesting that these cattle may have a degree of prior immunity against infection with AlHV-1).

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Cleaveland, Professor Sarah
Authors: Lankester, F., Lugelo, A., Werling, D., Mnyambwa, N., Keyyu, J., Kazwala, R., Grant, D., Smith, S., Parameswaran, N., Cleaveland, S., Russell, G., and Haig, D.
College/School:College of Medical Veterinary and Life Sciences > Institute of Biodiversity Animal Health and Comparative Medicine
Journal Name:Veterinary Microbiology
Publisher:Elsevier
ISSN:0378-1135
Published Online:23 September 2016
Copyright Holders:Copyright © 2016 Crown Copyright
First Published:First published in Veterinary Microbiology 195: 144-153
Publisher Policy:Reproduced under a Creative Commons License

University Staff: Request a correction | Enlighten Editors: Update this record

Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
518811Towards the strategic control of foot-and-mouth disease in Africa: new techniques for a neglected problemSarah CleavelandBiotechnology and Biological Sciences Research Council (BBSRC)BB/H009302/1RI BIODIVERSITY ANIMAL HEALTH & COMPMED