Four new cases of bird flu at Iowa turkey farms in the past few days will push the number of birds slaughtered nationwide this month to limit the spread of the virus up to nearly 700,000.
The latest cases announced by the Iowa Department of Agriculture only add to the toll of this year's ongoing outbreak that has prompted officials to kill more than 53 million birds in 47 states. Anytime the virus is found, the entire flock is killed to help control the disease.
