Dr. Lyle Petersen, director of Centers for Disease Control and Prevention's Division of Vector-Borne Infectious Diseases, said of the total cases, 54 percent were classified as neuroinvasive disease such as meningitis or encephalitis and 46 percent were classified as non-neuroinvasive disease.
In comparison, the numbers reported last week were 1,590 total cases, 889 neuroinvasive disease cases, and 66 deaths, therefore, this week's numbers represented about a 25 percent increase over last week, Petersen said.
More than 70 percent of the cases have been reported from the following six states: Texas, South Dakota, Mississippi, Oklahoma, Michigan and Louisiana. Nearly 45 percent of all cases have been reported from Texas.
"Although we may be past the historical peak, we expect that a great many cases of West Nile virus disease have not yet been reported, largely because of the lag between when a person gets sick and when the illness is reported," Petersen said in a statement. "Even if West Nile virus transmission were to stop today, we would continue to see reports of cases for several weeks."