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Viruses 2017, 9(5), 124; doi:10.3390/v9050124

A Japanese Encephalitis Virus Vaccine Inducing Antibodies Strongly Enhancing In Vitro Infection Is Protective in Pigs

1
Institute of Virology and Immunology, Sensemattstrasse 293, 3147 Mittelhäusern, Switzerland
2
Department of Infectious Diseases and Immunopathology, Vetsuisse Faculty, University of Bern, Länggassstrasse 122, 3001 Bern, Switzerland
3
Virologie Moléculaire et Vaccinologie, Institut Pasteur, 75015 Paris, France
*
Author to whom correspondence should be addressed.
Academic Editors: Linda Dixon and Simon Graham
Received: 5 April 2017 / Revised: 12 May 2017 / Accepted: 18 May 2017 / Published: 22 May 2017
(This article belongs to the Special Issue Porcine Viruses)
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Abstract

The Japanese encephalitis virus (JEV) is responsible for zoonotic severe viral encephalitis transmitted by Culex mosquitoes. Although birds are reservoirs, pigs play a role as amplifying hosts, and are affected in particular through reproductive failure. Here, we show that a lentiviral JEV vector, expressing JEV prM and E proteins (TRIP/JEV.prME), but not JEV infection induces strong antibody-dependent enhancement (ADE) activities for infection of macrophages. Such antibodies strongly promoted infection via Fc receptors. ADE was found at both neutralizing and non-neutralizing serum dilutions. Nevertheless, in vivo JEV challenge of pigs demonstrated comparable protection induced by the TRIP/JEV.prME vaccine or heterologous JEV infection. Thus, either ADE antibodies cause no harm in the presence of neutralizing antibodies or may even have protective effects in vivo in pigs. Additionally, we found that both pre-infected and vaccinated pigs were not fully protected as low levels of viral RNA were found in lymphoid and nervous system tissue in some animals. Strikingly, the virus from the pre-infection persisted in the tonsils throughout the experiment. Finally, despite the vaccination challenge, viral RNA was detected in the oronasal swabs in all vaccinated pigs. These latter data are relevant when JEV vaccination is employed in pigs. View Full-Text
Keywords: Japanese encephalitis virus; antibody-dependent enhancement of infection; Fc receptor; lentiviral vector vaccine; vaccine-induced protection; persistence; mucosal virus shedding Japanese encephalitis virus; antibody-dependent enhancement of infection; Fc receptor; lentiviral vector vaccine; vaccine-induced protection; persistence; mucosal virus shedding
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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. (CC BY 4.0).

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MDPI and ACS Style

García-Nicolás, O.; Ricklin, M.E.; Liniger, M.; Vielle, N.J.; Python, S.; Souque, P.; Charneau, P.; Summerfield, A. A Japanese Encephalitis Virus Vaccine Inducing Antibodies Strongly Enhancing In Vitro Infection Is Protective in Pigs. Viruses 2017, 9, 124.

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