<br>Some serovars can become endemic in a herd causing minimal disease but presenting a major zoonotic concern.
<br>Some serovars can become endemic in a herd causing minimal disease but presenting a major zoonotic concern.
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Diagnosis is made on a combination of clinical signs and identification of the orgainism by laboratory testing.
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==Laboratory Tests==
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Paired serum samples showing a positive rise in antibody titre can be used in some cases for confirmation of infection. The organism can be isolated by culture in a special medium, of it can be viewed under dark field microscopy.