provide answers to specific criteria set forward in Hill-Evans postulates. A causal link between Map and Crohn’s disease remains a plausible hypothesis that warrants a new research approach and steps by industry and government agencies to identify and mitigate avenues of.

CONCLUSION 3. Available diagnostic tests and information about the biology of JD and methods to control it are adequate for immediate implementation of control programs.

CONCLUSION 4. There are significant gaps in knowledge about some areas relevant to control, and are discussed below under recommendations. The committee emphasizes that closing those gaps will improve control programs, although the need for information should not delay their implementation.

CONCLUSION 5. Control of JD will require a long-term commitment and iterative program implementation to maximize the chance of success. This commitment must come from all constituencies, including USDA, state agencies, and industry.

CONCLUSION 6. Because JD is currently of greatest concern to the dairy industry much of the emphasis in control recommendations is directed there. Other industries, however, should consider this an opportune time to deal aggressively with the disease, before infection prevalence increases and the disease becomes more widespread.

CONCLUSION 7. The USDA National Animal Health Monitoring System (NAHMS) prevalence surveys for JD have been a critical element in laying the groundwork for control programs.

CONCLUSION 8. The Voluntary Bovine Johne’s Disease Control Program proposed by the National Johne’s Working Group (NJWG) has most of the elements necessary for a successful control program, but prospects for success are and will be limited by a lack of uniform implementation among individual states.

CONCLUSION 9. The committee endorses the NWJG’s efforts in educating producers and veterinarians, and advocates the expansion of these efforts.


JD control programs are based on knowledge about the transmission of Map, the organism’s persistence in the environment, and methods for reducing exposure to Map in animal environments. Minimum requirements for control therefore include identification of major transmission points, diagnostic and

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