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Galdo Novo, S.,Malirat, V.,Maradei, E.D.,Pedemonte, A.R.,Espinoza, A.M.,Smitsaart, E.,Lee, K.N.,Park, J.H.,Bergmann, I.E. Elsevier 2018 Vaccine Vol.36 No.12
<P><B>Abstract</B></P> <P>In 2010 serotype O foot-and-mouth disease virus of the Mya98 lineage/SEA topotype spread into most East Asian countries. During 2010–2011 it was responsible for major outbreaks in the Republic of Korea where a monovalent O/Manisa vaccine (belonging to the ME-SA topotype) was applied to help control the outbreaks. Subsequently, all susceptible animals were vaccinated every 6 months with a vaccine containing the O/Manisa antigen. Despite vaccination, the disease re-occurred in 2014 and afterwards almost annually. This study focuses on the <I>in vivo</I> efficacy in pigs of a high quality monovalent commercial O<SUB>1</SUB>/Campos vaccine against heterologous challenge with a representative 2015 isolate from the Jincheon Province of the Republic of Korea. Initially, viral characterizations and r<SUB>1</SUB> determinations were performed on six viruses recovered in that region during 2014–2015, centering on their relationship with the well characterized and widely available O<SUB>1</SUB>/Campos vaccine strain. Genetic and antigenic analysis indicated a close similarity among 2014–2015 Korean isolates and with the previous 2010 virus, with distinct differences with the O<SUB>1</SUB>/Campos strain. Virus neutralisation tests using O<SUB>1</SUB>/Campos cattle and pig post vaccination sera and recent Korean outbreak viruses predicted acceptable cross-protection after a single vaccination, as indicated by r<SUB>1</SUB> values, and in pigs, by expectancy of protection. In agreement with the <I>in vitro</I> estimates, <I>in vivo</I> challenge with a selected field isolate indicated that O<SUB>1</SUB>/Campos primo vaccinated pigs were protected, resulting in a PD50 value of nearly 10. The results indicated that good quality oil vaccines containing the O<SUB>1</SUB>/Campos strain can successfully be used against isolates belonging to the O Mya98/SEA topotype.</P>