milk yield and lactation stage are associated with positive results to elisa for mycobacterium avium subsp. paratuberculosis in dairy cows from northern antioquia, colombia: a preliminary study.paratuberculosis is a slow-developing infectious disease characterized by chronic granulomatous enterocolitis. this disease has a variable incubation period from 6 months to over 15 years and is caused by mycobacterium avium subsp. paratuberculosis (map). some studies have been conducted in cattle during the last decades in colombia. however, those studies were designed using relatively small populations and were not aimed to establish prevalence. this study aimed to determine the map seropreval ...201627165342
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