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Mosquito-Borne Diseases Data Statistics


West Nile Virus: Data and Statistics

In 2023, 4 cases of West Nile virus (WNV) disease, were reported in Delaware for an incidence rate of 0.4 cases per 100,000 population. (Table 1). All cases in 2023 were neuroinvasive cases. Cases of mild illness (non-neuroinvasive disease) are more likely to be underreported compared to more severe disease (neuroinvasive) cases. 

Table 1. West Nile Virus Disease Case Counts and Incidence Rates by Year and County, Delaware, 2019-2023

 

CASE COUNTS

INCIDENT RATE PER 100,000 POPULATION*

YEAR

NEW CASTLE
COUNTY

KENT
COUNTY

SUSSEX
COUNTY

DELAWARE

DELAWARE
 

2023

4

0

0

4

0.4

2022

0

0

1

1

0.1

2021

0

2

1

3

0.3

2020

0

0

0

0

0.0

2019

0

0

0

0

0.0

* Rates based on small numbers (less than 20) result in a large relative standard error, indicating an imprecise estimate that is unstable and unreliable.

+ 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 (Current year incidence rates and case count subject to change when new population estimates are published, and data is finalized).  

Source: Delaware Department of Health and Social Services, Division of Public Health, Office of Infectious Disease Epidemiology, Delaware Electronic Reporting and Surveillance System

 

Other Mosquito-Borne Diseases: Data and Statistics

Table 2. Mosquito-Borne Disease Case Counts and Incidence Rates by Travel Status, Delaware, 2023

DISEASE

TRAVEL-ASSOCIATED CASE COUNTS

LOCALLY ACQUIRED CASE COUNTS

DELAWARE CASE COUNTS

DELAWARE INCIDENCE RATE PER 100,000 POPULATION*

Chikungunya

0

0

0

0.0

Dengue

5

0

5

0.5

Eastern Equine Encephalitis

0

0

0

0.0

Jamestown Canyon

0

0

0

0.0

La Crosse Encephalitis

0

0

0

0.0

Malaria

13

0

13

1.3

St. Louis Encephalitis

0

0

0

0.0

Yellow Fever

0

0

0

0.0

Zika

0

0

0

0.0

* Rates based on small numbers (less than 20) result in a large relative standard error, indicating an imprecise estimate that is unstable and unreliable.

+ 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 (Current year incidence rates and case count subject to change when new population estimates are published, and data is finalized).  

Source: Delaware Department of Health and Social Services, Division of Public Health, Office of Infectious Disease Epidemiology, Delaware Electronic Reporting and Surveillance System

 

Office of Infectious Disease Epidemiology

24/7 Emergency Contact Number: 1-888-295-5156

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