Foreign Animal Diseases. Important transmissible livestock or poultry diseases that are largely absent from the United States and its territories and that have the potential to cause significant health or economic impact should the causative agent be introduced. Foreign animal diseases discussed in this chapter include:
Recently Emergent Diseases. Infectious diseases for which the risk in animals has increased in the past two decades or threatens to increase in the near future. These diseases include:
The recently emergent diseases addressed in this chapter are:
Previously Unknown Agents. Pathogens previously unrecognized that have recently (within the past decade) been transmitted from animals to humans. Included for discussion in this chapter:
eliminated by state regulatory authorities prior to spread of the disease (Molenda, 2003).
Despite the recognized and significant economic impacts of END introduction into the U.S. commercial poultry industry and the repeatedly observed risk of reintroduction in California, surveillance, detection, and diagnostic approaches were little changed in 2002 from those used in 1971. The accepted diagnostic standard was virus isolation in embryonated