insecticides

Experts say 2012 could be the worst outbreak of West Nile virus the nation has ever seen. Texas has been hit the hardest. In Dallas County, home to the vast majority of state cases, the growing number of deaths and illnesses has prompted officials to declare a state of emergency.

Experts say 2012 could be the worst outbreak of West Nile virus the nation has ever seen. Texas has been hit the hardest. In Dallas County, home to the vast majority of state cases, the growing number of deaths and illnesses has prompted officials to declare a state of emergency.