Johne's disease: Reliability of environmental sampling to identify MAP-positive cow-calf herds.
What is it about?
Johne's disease is chronic Enteritis mainly in ruminants caused by Mycobacterium avium ssp. paratuberculosis (MAP). This study evaluates the reliability of environmental sampling in beef cow-calf herds in order to identify MAP-positive herds. We have shown for the first time that applying this approach to beef cow-calf herds can be similar effective as in dairy herds and that the within-herd prevalence of MAP-shedders influences the herd-level diagnostic sensitivity.
Why is it important?
A zoonotic potential of MAP-infection is discussed. Herds with a high percentage of MAP shedders account for the highest risk of MAP shedding into the environment and the food chain. It is important to identify these herds in order to implement control measures. Currently, identification of MAP-positive herds is hampered by the lack of affordable, sufficiently sensitive and reliable diagnostic approaches at herd level. Our study was performed in well characterized cow-calf herds with either a low or a high level of the within-herd prevalence of MAP-shedders known from concurrent individual faecal culture testing, and provides valid Information regarding the performance of the diagnostic approach.
The following have contributed to this page: Karsten Donat