Bird flu vaccine, under development, divides U.S. poultry industry

CHICAGO, June 8 (Reuters) - The death of more than 46 million chickens and turkeys in a bird flu outbreak is opening a rare fissure within the usually tight-knit U.S. poultry industry, pitting farmers with infected flocks against those who so far largely have sidestepped the worst outbreak in U.S. history.