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Recombinant Modified Vaccinia Virus Ankara (MVA) Vaccines Efficiently Protect Cockatiels Against Parrot Bornavirus Infection and Proventricular Dilatation Disease

1
Institute of Virology, Medical Center–University of Freiburg, Faculty of Medicine, University of Freiburg, Hermann-Herder-Str. 11, D-79104 Freiburg, Germany
2
Department of Immunology, Interfaculty Institute of Cell Biology, Eberhard Karls Universität Tübingen, Auf der Morgenstelle 15, D-72076 Tübingen, Germany
3
Institute for Veterinary Pathology, University Justus Liebig Gießen, Frankfurter Str. 96, D-35392 Gießen, Germany
4
Institute of Diagnostic Virology, Friedrich-Loeffler-Institut, Südufer 10, D-17493 Greifswald–Insel Riems, Germany
*
Author to whom correspondence should be addressed.
Viruses 2019, 11(12), 1130; https://doi.org/10.3390/v11121130
Received: 10 November 2019 / Revised: 3 December 2019 / Accepted: 4 December 2019 / Published: 6 December 2019
(This article belongs to the Section Animal Viruses)
Parrot bornaviruses (PaBVs) are the causative agents of proventricular dilatation disease (PDD), a chronic and often fatal neurologic disorder in Psittaciformes. The disease is widely distributed in private parrot collections and threatens breeding populations of endangered species. Thus, immunoprophylaxis strategies are urgently needed. In previous studies we demonstrated a prime-boost vaccination regime using modified vaccinia virus Ankara (MVA) and Newcastle disease virus (NDV) constructs expressing the nucleoprotein and phosphoprotein of PaBV-4 (MVA/PaBV-4 and NDV/PaBV-4, respectively) to protect cockatiels (Nymphicus hollandicus) against experimental challenge infection. Here we investigated the protective effect provided by repeated immunization with either MVA/PaBV-4, NDV/PaBV-4 or Orf virus constructs (ORFV/PaBV-4) individually. While MVA/PaBV-4-vaccinated cockatiels were completely protected against subsequent PaBV-2 challenge infection and PDD-associated lesions, the course of the challenge infection in NDV/PaBV-4- or ORFV/PaBV-4-vaccinated birds did not differ from the unvaccinated control group. We further investigated the effect of vaccination on persistently PaBV-4-infected cockatiels. Remarkably, subsequent immunization with MVA/PaBV-4 and NDV/PaBV-4 neither induced obvious immunopathogenesis exacerbating the disease nor reduced viral loads in the infected birds. In summary, we demonstrated that vaccination with MVA/PaBV-4 alone is sufficient to efficiently prevent PaBV-2 challenge infection in cockatiels, providing a suitable vaccine candidate against avian bornavirus infection and bornavirus-induced PDD. View Full-Text
Keywords: avian bornaviruses; parrot bornavirus 2 (PaBV-2); parrot bornavirus 4 (PaBV-4); recombinant viral vector vaccines; modified vaccinia virus Ankara (MVA); proventricular dilatation disease (PDD) avian bornaviruses; parrot bornavirus 2 (PaBV-2); parrot bornavirus 4 (PaBV-4); recombinant viral vector vaccines; modified vaccinia virus Ankara (MVA); proventricular dilatation disease (PDD)
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MDPI and ACS Style

Rall, I.; Amann, R.; Malberg, S.; Herden, C.; Rubbenstroth, D. Recombinant Modified Vaccinia Virus Ankara (MVA) Vaccines Efficiently Protect Cockatiels Against Parrot Bornavirus Infection and Proventricular Dilatation Disease. Viruses 2019, 11, 1130.

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