I researched this from news from various reported incidents
Iowa Governor Terry Branstad declared a state of emergency in his state on Friday to confront a spiraling bird flu outbreak.
Millions of birds across the country have been infected by the highly pathogenic H5 avian flu in the most recent outbreak, which could result in the biggest death toll in U.S. history.
Iowa becomes 3rd state to declare emergency over avian flu outbreak
Nationally, the number of poultry that will have died or been exterminated to prevent further spread of the highly infectious virus is expected to increase to about 21 million based on the latest cases in Iowa. That would exceed the 17 million that were killed in the last major U.S. outbreak in the 1980s.