The Centers for Disease Control and Prevention (CDC) has documented cases of West Nile Disease in Arizona, Arkansas, Colorado, Illinois and Iowa.  Mosquitoes that carry this disease and also Zika Virus infection have been identified in six states including those where outbreaks have occurred. 

The seasonal occurrence of arbovirus infections in equines and humans in the U.S. suggests that poultry flocks might be subjected to infection.  Although West Nile Disease and Eastern Equine Encephalitis do not generally cause clinical signs in chickens, other related viruses such as Highland-J may impact egg production or hatchability in chicken or turkey flocks requiring laboratory diagnosis by a suitably equipped and staffed facility.