Heterologous challenge in the presence of maternally-derived antibodies results in vaccine-associated enhanced respiratory disease in weaned piglets

Date
2016-04-01
Authors
Rajao, Daniela
Sandbulte, Matthew
Gauger, Phillip
Roth, James
Kitikoon, Pravina
Platt, Ratree
Roth, James
Perez, Daniel
Loving, Crystal
Vincent, Amy
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Roth, James
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Veterinary Microbiology and Preventive MedicineVeterinary Diagnostic and Production Animal Medicine
Abstract

Control of influenza A virus (IAV) in pigs is done by vaccination of females to provide maternally-derived antibodies (MDA) through colostrum. Our aim was to evaluate if MDA interfere with IAV infection, clinical disease, and transmission in non-vaccinated piglets. In the first study, naïve sows were vaccinated with H1N2-δ1 whole inactivated virus (WIV) vaccine. In a follow-up study seropositive sows to 2009 pandemic H1N1 (H1N1pdm09) were boosted with H1N1pdm09 WIV or secondary experimental infection (EXP). MDA-positive pigs were challenged with homologous or heterologous virus, and MDA-negative control groups were included. WIV-MDA piglets were protected from homologous infection. However, piglets with WIV-derived MDA subsequently challenged with heterologous virus developed vaccine associated enhanced respiratory disease (VAERD), regardless of history of natural exposure in the sows. Our data indicates that although high titers of vaccine-derived MDA reduced homologous virus infection, transmission, and disease, MDA alone was sufficient to induce VAERD upon heterologous infection.

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This article is published as Rajao, Daniela S., Matthew R. Sandbulte, Phillip C. Gauger, Pravina Kitikoon, Ratree Platt, James A. Roth, Daniel R. Perez, Crystal L. Loving, and Amy L. Vincent. "Heterologous challenge in the presence of maternally-derived antibodies results in vaccine-associated enhanced respiratory disease in weaned piglets." Virology 491 (2016): 79-88. doi: 10.1016/j.virol.2016.01.015.

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