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Use of diagnostics for risk-based control of paratuberculosis in dairy herds

INFECTIONS with Mycobacterium avium subspecies paratuberculosis (MAP) can cause significant economic losses in dairy herds. Control of paratuberculosis in dairy cattle requires changes in management procedures to break transmission routes, and primarily involves immediate removal of calves from their dam at birth, frequent cleaning of calving areas and separation of calves from cow manure. These measures can be time consuming to implement. Since only a proportion of the cows in a herd may be shedding MAP, control measures need only apply to infectious cows. However, continuous monitoring is required to detect newly infectious individuals in the herd. This article describes an approach to risk-based control of paratuberculosis in dairy herds.

Søren Saxmose Nielsen graduated from the Royal Veterinary and Agricultural University in Copenhagen in 1998. He holds a PhD for studies on the interpretation of diagnostics for paratuberculosis. He is currently associate professor in veterinary epidemiology at the University of Copenhagen.