Ohio's first human bird flu case was reported in Mercer County yesterday. Learn about testing for the virus, symptoms and the Ohio egg farming industry.

A Mercer County farm worker came into contact with dead poultry that was infected with the disease, the state's health department reports.

A new report suggests that more Americans may be walking around with bird flu − and not even know it. Researchers from the Centers for Disease Control and Prevention randomly tested 150 veterinarians for H5N1, or bird flu, antibodies, which would indicate if they had a recent infection.