UPDATE 1-Top U.S. turkey producer Minnesota finds 4th bird flu case -USDA
April 02, 2015 at 14:38 PM EDT
CHICAGO, April 2 (Reuters) - A virulent strain of avian flu has spread for the first time to poultry in South Dakota and infected a fourth turkey flock in Minnesota, the nation's top turkey producer, the U.S. Department of Agriculture said on Thursday.