Effect of Emphasis Type="Italic"Mycobacterium av

Authors: E Raffo P Steuer G Monti M Salgado

Publish Date: 2017/03/10

Volume: 49, Issue: 4, Pages: 771-775

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Abstract

Currently the Chilean authority has implemented a National Eradication Program for bovine tuberculosis bTB aimed at controlling and eradicating the disease in Chile The area under study has a low withinherd prevalence has a relatively low number of infected herds and is one of the major milk and beef producing areas in the country However so far no attempts at eradicating the disease have been successful It has been suggested that the diagnostic tests used were either not sensitive or specific enough In addition previous studies have shown that a great number of herds are infected with Mycobacterium avium subsp paratuberculosis MAP The present study estimates the effect of MAP infection under field conditions on the diagnostic sensitivity and specificity of routine tests in live animals for Mycobacterium bovis infection diagnosis in cattle In general the estimations of test accuracy observed an increase in the sensitivity and specificity on MAPinfected animals for tuberculin test but observed a decrease in the sensitivity of gamma interferon tests for MAPinfected cattle These results are different from those of previous studies considering the role of MAP infection as an interfering infection More research is needed in order to understand the complex interactions of the different mycobacteria that can be found infecting production cattleThis work was supported by the Proyecto Fondos para la Innovación Competitiva Región de Los Ríos 2012 Eduardo Raffo and Pamela Steuer were recipients of a Postgraduate Studentship from the Chilean government CONICYT during the present study We thank all the farmers practitioners who participated and collaborated in the collection of sampling personnel of Animal Health Services SAG and personnel at slaughterhouses Carnes Ñuble and MAFRISUR

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