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• W2084787030 abstract "Johne's disease (JD) or paratuberculosis, caused by Mycobacterium avium subsp. paratuberculosis (MAP), is one of the most widespread and economically important diseases of livestock and wild ruminants worldwide. Attempts to control JD have proven inordinately difficult due to low levels of sensitivity by currently available diagnostic tests, which are also incapable of detecting prepatent MAP infections. In the present work, we describe the use of a flow cytometry method (FCM) for serological diagnosis of subclinical and clinical JD in cattle. The FCM was capable of distinguishing MAP-infected from MAP-non-infected cattle as well as MAP from M. scrofulaceum and M. avium subsp. avium. Results of the FCM were compared to that of a commercially available ELISA using 82 serum samples from JD-positive and JD-negative dairy and beef cattle farms that were separated into the following groups: (1) sera from a JD-free farm; (2) sera from JD-positive farms that had tested negative by ELISA; and (3) sera from JD-positive farms that tested JD-positive by ELISA. The FCM found that groups 1-3 were 6.6%, 73.3%, and 97.3% positive for MAP infections, respectively. By using 30 fecal culture-negative samples from a JD-free farm and 21 fecal culture-positive samples from JD-positive farms, diagnostic sensitivity and specificity of the FCM were calculated to be 95.2% and 96.7%, respectively. A retrospective study of 10 JD-positive cows showed that the FCM detected MAP infections 6-44 months earlier than the fecal culture test. Further, the FCM specifically detected MAP infections in serum samples as early as 170 days after experimental inoculation of calves with MAP and did not react with calves inoculated with other mycobacteria. Production of IgG against MAP was detected by FCM in all the calves inoculated with MAP 240 days after inoculation, whereas positive anti-MAP IgG production was not detected in control calves or calves experimentally infected with M. avium subsp. avium or M. bovis. The FCM assay is rapid and is completed in less than 4 h. Moreover, the FCM is objective, technically easy and can be automated for handling large numbers of samples. This novel assay might form the basis of a highly sensitive and subspecies-specific test for the diagnosis of JD." @default.
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• W2084787030 date "2005-09-01" @default.
• W2084787030 modified "2023-09-27" @default.
• W2084787030 title "New Method of Serological Testing for<i>Mycobacterium avium</i>subsp.<i>paratuberculosis</i>(Johne's Disease) by Flow Cytometry" @default.
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• W2084787030 doi "https://doi.org/10.1089/fpd.2005.2.250" @default.
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