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West Nile Virus: Data and Statistics

In 2018, 35 cases of West Nile virus (WNV) disease, including four deaths, were reported in Indiana for an incidence rate of 0.5 cases per 100,000 population. For the five-year reporting period from 2014 to 2018, 110 cases of WNV disease were reported (Figure 1). 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).

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

Figure 1. WNV Disease Cases by Year — Indiana, 2014–2018

Figure 2. WNV Disease Cases by Month of Illness Onset — Indiana, 2018

Figure 3. WNV Disease Incidence Rates by Age Group — Indiana, 2018

Number of cases per 100,000 population

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 WNV disease case definition 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, 2018, based on Census 2019 data estimates.

For additional county level statistics for WNV disease, please visit our Stats Explorer page.

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

Page Last Updated: November 5, 2020

Page Last Reviewed: November 5, 2020