Serological and Immunological Relationships between the 146S and 12S Particles of Foot-and-Mouth Disease Virus Free

Abstract

SUMMARY

Intact 146S particles of the seven serotypes of foot-and-mouth disease virus (FMDV) produce type-specific precipitating, complement-fixing and neutralizing antibodies in cattle and guinea-pigs. However, the 12S structural subunit, produced from the virus particle by mild acid treatment (pH 6) or by heating at 56 °C, although stimulating the production of precipitating and complement-fixing antibodies, produces only low levels of neutralizing antibody. Nevertheless, 12S particles were as active as 146S particles in stimulating the production of neutralizing antibody in guinea-pigs primed with a vaccine prepared from 146S particles. Moreover, heterotypic 12S and 146S particles also boosted the neutralizing antibody response to the first virus. These results point to an antigenic similarity between the 146S particles of each type and to a close antigenic relationship between the 146S and 12S particles.

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1980-10-01
2024-03-28
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