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Vaccine Protection Against Experimental Challenge Infection with a PPV-27a Genotype Virus in Pregnant Gilts

Authors Kiss I, Kovács E, Zádori Z, Mészáros I, Cságola A, Bajnóczi P, Mortensen P, Palya V

Received 1 November 2019

Accepted for publication 20 January 2020

Published 24 February 2020 Volume 2020:11 Pages 17—24


Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 2

Editor who approved publication: Professor Young Lyoo

István Kiss,1 Edit Kovács,1 Zoltán Zádori,2 István Mészáros,2 Attila Cságola,1 Pál Bajnóczi,3 Preben Mortensen,4 Vilmos Palya1

1Ceva-Phylaxia Co. Ltd., Budapest, Hungary; 2Institute for Veterinary Medical Research, Centre for Agricultural Research, Budapest, Hungary; 3Prophyl Ltd., Mohács, Hungary; 4Ceva Animal Health, Libourne, France

Correspondence: István Kiss
Ceva-Phylaxia Co. Ltd., Szállás U. 5, Budapest H-1107, Hungary
Tel +36 1262 9505
Fax +36010260 3889

Background/Introduction: Porcine parvovirus (PPV), the causative agent of severe reproductive failures in pigs, is present worldwide. The witnessed spread of the virulent 27a type PPV strains since its recognition raised concerns about the efficacy of the available commercial vaccines.
Methods: To address this question, vaccinated pregnant gilts were challenged with a PPV-27a-like virus strain and parameters related to vaccine efficacy were compared.
Results: The K22 vaccine strain of Parvoruvax® (PVX) was characterized as “Kresse-like” based on the epitope mapping data. Vaccination of the gilts induced a low level of antibody responses. Based on foetal mortality, the number of sows which had challenge virus-affected foetuses, the percent of PPV positive piglets/litters plus their PPV genome and viral load PVX outscored the other vaccinated groups.
Conclusion: Stronger protection was provided by the “Kresse-like” K22 PPV strain-based vaccine than by the NADL-2 and NADL-like strain-based commercial vaccines against a PPV-27a cluster strain challenge. Vaccine-induced antibody levels as measured pre-challenge were not found to be an accurate indicator of protection.

Keywords: PPV, K22 strain, efficacy, PPV-27a

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