101. An inactivated whole-virus porcine parvovirus vaccine protects pigs against disease but does not prevent virus shedding even after homologous virus challenge
- Author
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Stephanie Speck, Hans-Joachim Selbitz, André Felipe Streck, Thomas Lindner, Uwe Truyen, and Tessa Foerster
- Subjects
0301 basic medicine ,Porcine parvovirus ,Swine ,animal diseases ,viruses ,Virulence ,Virus ,Parvoviridae Infections ,03 medical and health sciences ,Virology ,Animals ,Viral shedding ,Swine Diseases ,biology ,Parvovirus ,Viral Vaccine ,Rectum ,Viral Vaccines ,Parvovirus, Porcine ,biology.organism_classification ,Virus Shedding ,Nasal Mucosa ,030104 developmental biology ,Vaccines, Inactivated ,Inactivated vaccine ,biology.protein ,Antibody - Abstract
Inactivated whole-virus vaccines against porcine parvovirus (PPV) can prevent disease but not infection and virus shedding after heterologous virus challenge. Here, we showed that the same is true for a homologous challenge. Pregnant sows were vaccinated with an experimental inactivated vaccine based on PPV strain 27a. They were challenged on day 40 of gestation with the virulent porcine parvovirus PPV-27a from which the vaccine was prepared (homologous challenge). On day 90 of gestation, the fetuses from vaccinated sows were protected against disease, while the fetuses of the non-vaccinated sows (control group) exhibited signs of parvovirus disease. All gilts, whether vaccinated or not vaccinated, showed a boost of PPV-specific antibodies indicative of virus infection and replication. Low DNA copy numbers, but not infectious virus, could be demonstrated in nasal or rectal swabs of immunized sows, but high copy numbers of challenge virus DNA as well as infectious virus could both be demonstrated in non-vaccinated sows.
- Published
- 2016