2012 West Nile virus update: September 25
As of September 25, 2012, 48 states have reported West Nile virus infections in people, birds, or mosquitoes. A total of 3,545 cases of West Nile virus disease in people, including 147 deaths, have been reported to CDC. Of these, 1,816 (51%) were classified as neuroinvasive disease (such as meningitis or encephalitis) and 1,729 (49%) were classified as non-neuroinvasive disease.
The 3,545 cases reported thus far in 2012 is the highest number of West Nile virus disease cases reported to CDC through the last week in September since 2003. Seventy percent of the cases have been reported from eight states (Texas, Mississippi, South Dakota, Michigan, California, Louisiana, Oklahoma, and Illinois) and 38 percent of all cases have been reported from Texas.