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Is the health status of a herd exposed and exposed with circulation of Coxiella burnetii related to the results of a bulk milk sample or a random blood sample of adult dairy animals?

Abstract:

Q fever is a zoonotic bacterial infection caused by Coxiella burnetii and widespread in Wallonia. The diagnosis of this disease is difficult and recommendations were issued by EFSA in terms of sampling to assess an individual diagnosis. These recommendations are based on expert opinion. In dairy herds, the access to bulk tank milk is a collection of common choice, inexpensive and reliable for the diagnosis at herd level. In the absence of bulk tank milk as in suckling herds, an alternative option could be the random sampling of 20 animals in the productive herd (adult animals) to reduce both the costs of sampling and analysis without decreasing the intrinsic properties of the diagnostic procedure. This procedure has been tested in 226 Walloon dairy herds randomly selected, for which the bulk tank milk was available together with a random serological sample of 20 animals over 24 months.