In 1999, 62 cases of severe disease, including 7 deaths, occurred in the New York area. In 2000, 21 cases were reported, including 2 deaths in the New York City area. In 2001, there were 66 human cases of severe disease and 9 deaths. In 2012, there were 2,734 cases of severe disease and 243 deaths.
No reliable estimates are available for the number of cases worldwide of West Nile encephalitis, the disease caused by the West Nile Virus. For the latest up-to-date information, visit the Centers for Disease Control and Prevention website on West Nile Virus.