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Livestock
Livestock & Forage
Johnes dilemma
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<blockquote data-quote="Whitepeak" data-source="post: 6182540" data-attributes="member: 45704"><p>We’ve just entered a health scheme, and did our first Johnes screen about a month ago. I spoke to one of the vets and he explained to me that the initial screen is testing for antibody, in other words an immune response from the cow, if she tests positive she has been exposed to Johnes but is potentially not infectious hence the need to retest. The retest (bloods and dung) tests for for antigen, ie. presence of infection. So a cow could test positive on the 1st test but then go clear on retest as she isn’t infectious/excreting disease. Although there is a high likelihood of her becoming infectious so at some point particularly if she has a very high initial test result. Therefore they recommend to isolate all positive animals and consider culling.</p><p>TB testing can interfere with blood testing due to TB and Johnes being from the same bacteria family. Dung samples aren’t effected by TB testing however.</p></blockquote><p></p>
[QUOTE="Whitepeak, post: 6182540, member: 45704"] We’ve just entered a health scheme, and did our first Johnes screen about a month ago. I spoke to one of the vets and he explained to me that the initial screen is testing for antibody, in other words an immune response from the cow, if she tests positive she has been exposed to Johnes but is potentially not infectious hence the need to retest. The retest (bloods and dung) tests for for antigen, ie. presence of infection. So a cow could test positive on the 1st test but then go clear on retest as she isn’t infectious/excreting disease. Although there is a high likelihood of her becoming infectious so at some point particularly if she has a very high initial test result. Therefore they recommend to isolate all positive animals and consider culling. TB testing can interfere with blood testing due to TB and Johnes being from the same bacteria family. Dung samples aren’t effected by TB testing however. [/QUOTE]
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Johnes dilemma
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