A suspected case of avian influenza has been identified in poultry in Arkansas, the third-largest US turkey producer and home to Tyson Foods Inc, the nation's biggest chicken company, the US Department of Agriculture said on Tuesday. CHICAGO: A suspected case of avian influenza has been identified in poultry in Arkansas, the third-largest US turkey producer and home to Tyson Foods Inc, the nation's biggest chicken company, the US Department of Agriculture said on Tuesday.