Abstract

Europe produced a severe nervous disease with high mortality in pigs and was associated with natural epizootics of polioencephalomyelitis (Trefney, 1930; Mayr and Hecke, 1960). The poliomyelitis suum virus which was isolated in Demark was serologically related to the Teschen group but was of a considerably milder virulence (Bendixon and Sjolte, 1955). In England the Talfan virus was isolated from a mild

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