West Nile Virus: Data and Statistics

In 2022, 6 cases of West Nile virus (WNV) disease, were reported in Indiana for an incidence rate of 0.1 cases per 100,000 population. All cases reported in 2022 were neuroinvasive cases. Cases of mild illness (non-neuroinvasive disease) are more likely to be underreported compared to more severe disease (neuroinvasive) cases. For the reporting period from 2012 to 2022, 157 cases of WNV disease were reported (Figure 1).

For maps showing recent WNV infections in people, horses, and mosquitoes, click here.

Although the disease is most common in the late summer months, WNV disease can occur any time during the mosquito season; which in Indiana is usually from May through October (Figure 2).

People older than 50 years of age are at higher risk of WNV disease in Indiana (Figure 3).

NOTE: These data include confirmed and probable cases according to national surveillance case definitions adopted by the Council of State and Territorial Epidemiologists (CSTE). The arboviral disease case definition which includes WNV, may be found here. All rates are calculated per 100,000 population based on the U.S. Census Bureau’s population estimates for July 1, 2022.

For prior years’ WNV disease statistics, please visit our annual report pages.