SUPPLEMENTARY INFORMATION:BackgroundThe National Poultry Improvement Plan (NPIP, also referred to below as “the Plan”) is a cooperative Federal-State-industry mechanism for controlling certain poultry diseases. The term official supervision is currently defined as it applies to Plan programs and to non-Plan but equivalent State poultry improvement programs. However, as written, the Newcastle disease clean program has instead become a hindrance to the AI compartmentalization program and undermined initial intent. This document may be obtained from the National Poultry Improvement Plan (NPIP) website at https://www.poultryimprovement.org or by writing to the Service at National Poultry Improvement Plan, APHIS, USDA, 1506 Klondike Road, Suite 301, Conyers, GA 30094. This document may be obtained from the National Poultry Improvement Plan (NPIP) website at https://www.poultryimprovement.org/​ or by writing to the Service at National Poultry Improvement Plan, APHIS, USDA, 1506 Klondike Road, Suite 301, Conyers, GA 30094.