West Nile Virus Surveillance Data

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Vector-Borne Disease
Public Health
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What you need to know

​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​​The first case of West Nile Virus in Nebraska was reported in 2002.

In 2021, there were 107 clinical cases of West Nile Virus reported in Nebraska. 69 cases were neuroinvasive and 38 were non-neuroinvasive.

It is important to note that for every neuroinvasive case of West Nile Virus, there is an estimated 30-70 non-neuroinvasive cases so the number of total cases in the state is likely much higher.

The DHHS West Nile Virus Surveillance Program works to identify and prevent West Nile virus in Nebraska by

  • Trapping and testing mosquitoes
  • Collect reports of dead birds
  • Investigating suspected human WNV cases.

The Nebraska Department of Agriculture investigates possible cases involving horses. For all suspected human cases, the DHHS and the local public health departments conduct investigations.

Vector-borne​ Weekly Report

A weekly summary of Nebraska vector-borne disease surveillance.

Arboviral Surveillance Report

A weekly summary of adult mosquito and arbovirus testing in Nebraska.

​2022 Data​​

Humans

Category
NumberMaps
Clinical Positive Individuals59
Clinical Posi​tive 2022
Positive Blood Donors24
Blood Donor Positive 2022
Cumulative Clinical and Blood Donor Cases​​83


2022 Human Clinical Specifics

Age RangeNumber
0-13 0
14-25 2
26-5016
51-6415
65+26
Gender
Male39
Female20
Diagnosis
WNV Neuroinvasive33
WN Non-Neuroinvasive26
Hospitalized31
Deaths 3


Animals

Surveillance
Type
Number
Reported
Number
Tested
Number
Positives
Maps
Mosquito Pools 992
  • 88 positive WNV
  • 1 positive SLE
Mosquito 2022
EquinesNANA 2
Equine 2022




Total Human WNV Cases in Nebraska 2012-2021
Total Human WNV Cases in Nebraska 2012-2021​

Human WNV Clinical Cases 2012-2021
Human WNV Clinical Cases 2012-2021​

West Nile Virus 10 Yr Average Annual Human Case Rate
West Nile Virus 10 Year Average Annual Human Case Rate

Mosquito Surveillance Data

The Nebraska Department of Health and Human Services (NDHHS) in partnership with our local public health departments collects mosquitoes from across the state. These mosquitoes are then tested by the Nebraska Public Health Laboratory (NPHL) for the presence of arboviruses.

During the 2021 season, 1,390 mosquito pools* containing 17,520 Culex mosquitoes were tested. Of those pools tested, 38 positive WNV pools were detected. There was one positive St. Louis Encephalitis (SLE) virus mosquito pool detected from Scottsbluff County.

In 2021, the first WNV positive pool was detected during trapping period 5 in Scottsbluff County. In 2020, the first WNV positive mosquito pool was identified during trapping period 11 in Dodge County.

*mosquitoes are tested in pools of up to 50 mosquitoes according to species, site location, and collection date

West Nile Virus Positive Mosquito Pools Nebraska, 2021
West Nile Virus Positive Mosquito Pools Nebraska, 2021

West Nile Virus 10 Year Average Positive Pool Rate
West Nile Virus 10 Year Average Positive Pool Rate


Historical Data