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. 1988 Apr;52(2):199–204.

Evaluation of the serological response of sheep in one flock to Mycobacterium paratuberculosis by crossed immunoelectrophoresis.

B W Brooks 1, R H Robertson 1, A H Corner 1, B S Samagh 1, M M Garcia 1, C Turcotte 1, J R Duncan 1
PMCID: PMC1255427  PMID: 3130975

Abstract

Sera from 74 sheep culled from one flock on the basis of performance and response to immunological tests for paratuberculosis or maedi visna were used to evaluate the serological response to a sonicated antigen of Mycobacterium paratuberculosis by crossed immunoelectrophoresis. A total of seven precipitating components was demonstrated. Four components (A,C,V,W) were detected in low frequency only with sera from animals with paratuberculosis while two components (X,Y) were detected in high frequency with sera from animals with or without paratuberculosis. One component (D) was observed in high frequency with sera from animals with paratuberculosis. The magnitude of the serological response to the D component as measured by crossed immunoelectrophoresis correlated well with bacterial load and generally agreed with the quantitative assessment by agar gel immunodiffusion. A development time for crossed immunoelectrophoresis of 24-72 hours after electrophoresis was required to achieve correlation with agar gel immunodiffusion.

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