Up to 10 December 2003, 591 people underwent serological tests for WNV in 25 states. Six people have shown positive results: four in Chihuahua, one in Sonora, and another in Nuevo León.

As of 17 July 2003, there are 5 human confirmed cases of West Nile Virus infection in the USA: Alabama (1), South Carolina (1) and Texas (3).

To date, 4,416 cases and 84 deaths have been reported to the Centers for Disease Control and Prevention of the United States (CDC), with 38 states reporting human cases. Colorado continues to be the most affected state (with 1,542 cases and 27 deaths...

On 7 August 2003, 164 cases of WNV infection were confirmed by the Centers by the Centers for Disease Control and Prevention in the United States.

The Centers for Disease Control and Prevention (CDC) in Atlanta reported 1,482 cases and 24 deaths from West Nile Virus.

According to the Centers for Disease Control and Prevention of the United States (CDC), 2,267 human infections and 43 deaths from West Nile Virus (WNV) have been reported to date, an increase of 53% over the last update (28 August 2003).

Up to 13 August 2003, 393 human cases of WNV infection were confirmed by the Centers for Disease Control and Prevention (CDC) in the United States. Nine deaths were registered: two in Alabama; five in Colorado and two in Texas.

Up to 24 July 2003, 12 cases of WNV were confirmed by the Centers for Disease Control and Prevention (CDC) in the United States.

The Centers for Disease Control and Prevention (CDC) confirmed 44 cases of WNV infection and one death. The cases were recorded in the states of Alabama (6), Colorado (4), Florida (4), Iowa (1), Louisiana (10), Minnesota (1), Mississippi (1), Ohio (1), South Carolina (1), South Dakota (4), and Texas (11).

As of 11 September, 37 states have reported human cases of WNV. The cumulative total is 3,307 cases and 64 deaths. This represents a 2.8-fold increase in the number of cases and a 1.5-fold increase in the number of deaths when compared to the same period in 2002.