Abstract
Immunisation of cattle with foot-and-mouth disease virus failed to raise a level of antibody that provides protection against heterotypic challenge. Further the 12S substructure, produced from the 146S particle, was ineffective in providing protection against challenge by homotypic virus. These findings suggest considerable antigenic differences in the virus serotypes and between the virus and its substructure. Inoculation of homologous 12S and heterologous 1246S and 12S antigens into vaccinated cattle, however, revealed antigenic relationship between different serotypes, and between serotypes and their substructures.
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