Pseudorabies (Aujeszky's disease) eradication - USA

The AD eradication plan was initialed in 1989 at the federal level with a 10-year completion date target of the year 2000. Most states required new legislation to support the program. The plan has been a joint effort with federal agencies contributing funds and rules; producer groups, producers and national groups as Livestock Conservation Inc., and US Animal Health Association state/federal extension staff, and industry. A National Advisory Committee was formed to establish program priorities, monitor progress, assist in program reviews in states and to monitor research and field evaluation. In general states enter the program at various levels and move through ''stages'' as they are able. Currently stales are in various stages and some have split status (Table). The status affects animal movement. Funding for the program has come from federal and stare governments and producers. Federal funds have been distributed on the basis of need and program success. The fives stages in the plan are: I. Preparation, II. Control, III. Mandatory Herd Clean-Up, IV, Surveillance, V. Free Status, Herds are classified into the following categories ''Qualified Negative Herd'', ''Qualified Negative Vaccinated Herd'', ''Monitored Feeder Pigs''. Herd clean up plans are variable by stale or area and are regulated by the state PR committee and regulatory officials. One of four clean-up plans or variations are selected by veterinarian and herd owner: 1. Depopulation/Repopulation, 2. Test and Removal, 3. Off-spring Segregation, 4. Vaccination/Segregation. The program is based on an Official Statistical Test (90% detection if 10% of animals infected) (test all below 10 herds, test 30% - or min. 30 - above 36 heads). Random surveillance and monitoring is done al slaughterhouses or al first point of collection, with 10% of area population or breeding herds surveyed annually. Gene deleted vaccines are essential elements of eradication. They were first used in the 1980's and limitations placed on such products in the 1990's. Program standards allow any deletion but require the GI deletion. The progress of eradication and stages of various states of April 1995-January 1. 1997 are demonstrated on Figures 1 and 2. The sources of the new infection in herds are seen on the Figure 3.