Michigan obtained U.S. Pullorum-Typhoid Clean status in August 1989. To maintain this status, certain disease requirements must be met and are outlined in the National Poultry Improvement Plan and Auxiliary Provisions. All poultry, except waterfowl, pigeons and doves, shown at public exhibition in Michigan must originate from a U.S. pullorum-typhoid clean flock (NPIP certified) or have a negative official test for Salmonella pullorum-typhoid within 90 days before the exhibition, exposition, or show facility.