Frequency distribution of reactivity levels of foot-and-mouth disease infection-specific antibodies in livestock populations was analysed. Specific antibody responses against non-capsid polyprotein 3ABC were assessed through a highly sensitive indirect enzyme-linked immonosorbent assay (I-ELISA 3ABC). A graphic display of data was designed based on three negative and three positive categories to illustrate reactivity patterns. The resulting patterns were correlated to the epidemiological status. On this basis, results of over 100,000 sera derived from cattle populations in regions with various well-documented epidemiological situations were compiled and are exemplified in this paper. Distinct distributions of antibody reactivity patterns reflecting the various epidemiological situations were attained. Whereas non-affected areas presented a rather homogenous negative pattern with very limited test-positive reactions, affected regions revealed quite heterogeneous profiles, including positive and negative categories, with distributions that varied according to the region. The use of graphic prints encompassing I-ELISA 3ABC antibody profile responses constituted an adequate epidemiological indicator of the risk of foot-and-mouth disease viral activity, providing immediate visualization for a rapid inference of the epidemiological situation of a region. Moreover, such profiles allowed for convenient follow-up of infection after a focus as a function of time and geographical spread.
Archives of Virology – Springer Journals
Published: Apr 1, 2003
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