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<blockquote data-quote="simme" data-source="post: 1834009" data-attributes="member: 40418"><p>[USER=38595]@ClinchValley86[/USER] Study up a little on the internet about Johne's in cattle. There are progressive stages of the condition. There is a blood test used as a <strong>screening </strong>tool in the earlier stages. There is also a fecal PCR test that looks for active shedding in the manure in the later stages which means positive. A negative fecal test would occur in an infected animal that has not yet reached the shedding stage, even though the animal is positive. The blood test for screening looks for level of antibodies in the blood. Then there is some interpretation of the numeric score that assigns the results to categories - negative, suspect, low positive, positive, or strong positive. Followup on the screening test to confirm is a fecal test done at a later stage. Point is that Johnes testing is not as simple as other tests.</p><p></p><p>Even though you have dewormed her, consider doing a fecal egg count to check the level of worms (and effectiveness of the dewormer). There are cows with resistant worms that do not have a good response to dewormer. What product did you use to deworm? Fecal samples should be refrigerated if there is going to be a delay before testing.</p></blockquote><p></p>
[QUOTE="simme, post: 1834009, member: 40418"] [USER=38595]@ClinchValley86[/USER] Study up a little on the internet about Johne's in cattle. There are progressive stages of the condition. There is a blood test used as a [B]screening [/B]tool in the earlier stages. There is also a fecal PCR test that looks for active shedding in the manure in the later stages which means positive. A negative fecal test would occur in an infected animal that has not yet reached the shedding stage, even though the animal is positive. The blood test for screening looks for level of antibodies in the blood. Then there is some interpretation of the numeric score that assigns the results to categories - negative, suspect, low positive, positive, or strong positive. Followup on the screening test to confirm is a fecal test done at a later stage. Point is that Johnes testing is not as simple as other tests. Even though you have dewormed her, consider doing a fecal egg count to check the level of worms (and effectiveness of the dewormer). There are cows with resistant worms that do not have a good response to dewormer. What product did you use to deworm? Fecal samples should be refrigerated if there is going to be a delay before testing. [/QUOTE]
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