U.S. poultry producers are facing ongoing economic challenges due to avian flu as China and other importers have not lifted trade bans imposed during the worst outbreak of the virus in the country. The bans, which were put in place last year to contain the spread of the disease, are limiting the $6 billion export market for chicken meat. China, South Africa, and the Dominican Republic still have poultry bans from 37 states, and China's failure to lift the bans violates its trade deal with the U.S.