The avian flu is hammering U.S. poultry farmers, leaving experts to ask: What has changed?

The worst outbreak of avian influenza on record is threatening to stretch into a second year, as the U.S. races to contain a virus that has already caused some food prices to soar amid a shortage of eggs.
Nearly 58 million birds from commercial and backyard flocks have been wiped out in the U.S. since last February, according to the U.S. Department of Agriculture’s Animal and Plant Health Inspection Service. Click here to read the full article.