Due to scheduled maintenance by the Arizona Department of Administration to the state datacenter, azdhs.gov and related services will be unavailable from 10:00 p.m. Friday, November 15, until 10:00 a.m. Saturday, November 16. Thank you for your patience.
West Nile Virus
West Nile virus (WNV) has emerged in recent years in temperate regions of Europe and North America, presenting a threat to public and animal health. The most serious manifestation of WNV infection is fatal encephalitis (inflammation of the brain) in humans and horses, as well as mortality in certain domestic and wild birds. WNV has also been a significant cause of human illness in the United States. It first appeared in North America in 1999, and subsequently spread across the United States. WNV was first detected in Arizona in 2003.