TIMELINE-Tracing the bird flu outbreak in U.S. poultry flocks
April 28, 2015 at 19:08 PM EDT
April 28 (Reuters) - Two highly pathogenic strains of avian influenza (HPAI) have been found in 14 U.S. states since December, prompting partial to total bans on imports of U.S. poultry and egg products to other countries that were valued at more than $6 billion last year.