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St. Louis Encephalitis Virus
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June 18, 2024
February 28, 2025
Historic Data (2003-2023)
Key points
* ArboNET is a national arboviral surveillance system managed by CDC and state health departments.
* The visuals on this dashboard display St. Louis encephalitis virus data from 2003 – 2023.
View the historic data
Notice
Notice
The 2023 data are preliminary and subject to change. Data are current as of June 18, 2024.
Cumulative data for 2003-2023
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St. Louis encephalitis virus human disease cases by year of illness onset, 2003-2023
Please complete your selection to continue.
 
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49
15
13
10
9
13
12
10
6
3
1
10
23
8
11
8
17
16
17
33
2002040Reported Cases200320042005200620072008200920102011201220132014201520162017201820192020202120222023Year of Illness Onset
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Data Table - St. Louis encephalitis virus human disease cases by year of illness onset, 2003-2023
Data table showing data for the chart figure.
Year Press command, modifier, or enter key to sort by Year in ascending order Reported Cases Press command, modifier, or enter key to sort by Reported Cases in ascending order
2003 49
2004 15
2005 13
2006 10
2007 9
2008 13
2009 12
2010 10
2011 6
2012 3
2013 1
2014 10
2015 23
2016 8
2017 11
2018 8
2019 17
2020 16
2021 17
2022 33
2023 20
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Skipped data table.
St. Louis encephalitis virus human disease cases by age and sex, 2003-2023
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05%10%15%20%25%% of Total<1818-2930-3940-4950-5960-6970+Age Group
Sex
MaleFemale
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Data Table - St. Louis encephalitis virus human disease cases by age and sex, 2003-2023
Data table showing data for the chart figure.
Age Press command, modifier, or enter key to sort by Age in ascending order Male Press command, modifier, or enter key to sort by Male in ascending order Female Press command, modifier, or enter key to sort by Female in ascending order
<18 1% 2%
18-29 3% 2%
30-39 3% 4%
40-49 9% 6%
50-59 9% 10%
60-69 15% 7%
70+ 20% 9%
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Skipped data table.
Explore human data for 2003-2023
Please note – users may experience slow load times after selecting filters. Please allow the visualizations to fully load after selecting filters, which will be indicated by an updated visual title. The 'Type of case' selection option 'All disease cases' includes all reported neuroinvasive and non-neuroinvasive disease cases.
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Year2003-2023202320222021202020192018201720162015201420132012201120102009200820072006200520042003
Year
Type of caseAll disease casesNeuroinvasive disease cases
Type of case
 
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Human Disease Cases
304
Cases from year(s) and type of case selected above
Hospitalizations
207
Hospitalizations from year(s) and type of case selected above
Deaths
20
Deaths from year(s) and type of case selected above
St. Louis encephalitis virus human disease cases reported by month of illness onset, 2003-2023, All disease cases
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3
1
1
4
10
22
63
76
71
40
10
3050Reported CasesJanFebMarAprMayJunJulAugSepOctNovDecMonth of Illness Onset
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Data Table - St. Louis encephalitis virus human disease cases reported by month of illness onset from year(s) and type of case selected above
Data table showing data for the chart figure.
Month Press command, modifier, or enter key to sort by Month in ascending order Reported Cases Press command, modifier, or enter key to sort by Reported Cases in ascending order
Jan 3
Feb 1
Mar 1
Apr 4
May 10
Jun 22
Jul 63
Aug 76
Sep 71
Oct 40
Nov 10
Dec 3
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St. Louis encephalitis virus human disease cases reported by state of residence, 2003-2023, All disease cases
Explore county level data for 2003-2023
Please note – users may experience slow load times after selecting filters. Please allow the visualizations to fully load after selecting filters, which will be indicated by an updated visual title.
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Year2003-2023202320222021202020192018201720162015201420132012201120102009200820072006200520042003
Year
 
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St. Louis encephalitis virus human and non-human activity by county of residence, 2003-2023
St. louis encephalitis virus human and non-human activity by county for year selected above
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View the total number of human disease cases reported by county by hovering over the shaded counties below
* Non-human activity
* Human disease cases
* Human disease cases and non-human activity
About this map:
Non-human activity: Indicates that veterinary disease cases or infections in mosquitoes, birds, or sentinel animals have been reported to CDC.
Human disease cases: Indicates that human disease cases have been reported to CDC.
Human disease cases and non-human activity: Indicates that both human disease cases and non-human infections have been reported to CDC.
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Data Table - St. Louis encephalitis virus human and non-human activity by county for year selected above
Data table showing data for the United States County Map figure.
State, County Sort by State, County in descending order Activity Sort by Activity in descending order Total human disease cases Sort by Total human disease cases in descending order Neuroinvasive disease cases Sort by Neuroinvasive disease cases in descending order
DC, Washington Human disease cases 2 0
FL, Alachua Non-human activity 0 0
FL, Bay Non-human activity 0 0
FL, Brevard Non-human activity 0 0
FL, Charlotte Non-human activity 0 0
FL, Citrus Non-human activity 0 0
FL, Clay Non-human activity 0 0
FL, Collier Non-human activity 0 0
FL, Duval Human disease cases and non-human activity 2 2
FL, Hendry Non-human activity 0 0
FL, Hernando Non-human activity 0 0
FL, Hillsborough Non-human activity 0 0
FL, Indian River Non-human activity 0 0
FL, Lee Non-human activity 0 0
FL, Leon Non-human activity 0 0
FL, Manatee Non-human activity 0 0
FL, Martin Non-human activity 0 0
FL, Miami-Dade Non-human activity 0 0
FL, Nassau Non-human activity 0 0
FL, Orange Non-human activity 0 0
FL, Palm Beach Non-human activity 0 0
FL, Pasco Non-human activity 0 0
FL, Pinellas Non-human activity 0 0
FL, Polk Non-human activity 0 0
FL, Putnam Non-human activity 0 0
FL, St Johns Non-human activity 0 0
FL, St Lucie Non-human activity 0 0
FL, Sarasota Non-human activity 0 0
FL, Seminole Non-human activity 0 0
FL, Sumter Non-human activity 0 0
FL, Volusia Non-human activity 0 0
FL, Walton Non-human activity 0 0
GA, Cobb Human disease cases 1 0
GA, Lowndes Non-human activity 0 0
ID, Gem Non-human activity 0 0
ID, Minidoka Human disease cases 1 0
IL, Adams Non-human activity 0 0
IL, Cook Non-human activity 0 0
IL, Jersey Human disease cases 1 1
IL, Kankakee Non-human activity 0 0
IL, Knox Non-human activity 0 0
IL, La Salle Non-human activity 0 0
IL, Mchenry Non-human activity 0 0
IL, Macoupin Non-human activity 0 0
IL, Marshall Non-human activity 0 0
IL, Tazewell Non-human activity 0 0
IL, Will Non-human activity 0 0
IL, Williamson Non-human activity 0 0
IL, Winnebago Non-human activity 0 0
IN, Knox Human disease cases 1 1
IA, Black Hawk Non-human activity 0 0
IA, Carroll Non-human activity 0 0
IA, Story Non-human activity 0 0
KS, Ellis Human disease cases 1 1
KS, Reno Non-human activity 0 0
KS, Sedgwick Human disease cases and non-human activity 1 1
KY, Hardin Human disease cases 1 1
LA, Acadia Parish Non-human activity 0 0
LA, Allen Parish Non-human activity 0 0
LA, Ascension Parish Non-human activity 0 0
LA, Caddo Parish Human disease cases and non-human activity 2 0
LA, Calcasieu Parish Human disease cases and non-human activity 1 1
LA, Cameron Parish Non-human activity 0 0
LA, East Baton Rouge Parish Human disease cases and non-human activity 3 3
LA, Iberia Parish Non-human activity 0 0
LA, Jefferson Parish Human disease cases and non-human activity 1 1
LA, Lafayette Parish Non-human activity 0 0
LA, Lafourche Parish Non-human activity 0 0
LA, Livingston Parish Human disease cases 6 6
LA, Orleans Parish Human disease cases and non-human activity 3 3
LA, Ouachita Parish Non-human activity 0 0
LA, Pointe Coupee Parish Non-human activity 0 0
LA, Richland Parish Human disease cases 1 1
LA, St Bernard Parish Human disease cases and non-human activity 1 1
LA, St Martin Parish Non-human activity 0 0
LA, St Mary Parish Non-human activity 0 0
LA, St Tammany Parish Non-human activity 0 0
LA, Tangipahoa Parish Human disease cases and non-human activity 2 2
LA, Terrebonne Parish Non-human activity 0 0
LA, West Baton Rouge Parish Non-human activity 0 0
MD, Montgomery Human disease cases 1 0
MI, Kalkaska Human disease cases 1 0
MI, Macomb Human disease cases 1 1
MI, Oakland Human disease cases 3 3
MI, Saginaw Non-human activity 0 0
MI, St Joseph Human disease cases 1 1
MI, Wayne Human disease cases 4 4
MS, Adams Human disease cases 1 0
MS, Bolivar Human disease cases 1 1
MS, Coahoma Human disease cases 1 1
MS, Forrest Human disease cases 3 3
MS, Hancock Human disease cases 1 1
MS, Hinds Human disease cases 8 6
MS, Jackson Non-human activity 0 0
MS, Lincoln Human disease cases 1 0
MS, Marion Human disease cases 1 1
MO, Boone Human disease cases and non-human activity 1 0
MO, Camden Human disease cases 1 0
MO, Cape Girardeau Non-human activity 0 0
MO, Clay Human disease cases 1 1
MO, Jackson Human disease cases 1 0
MO, Jefferson Non-human activity 0 0
MO, Lawrence Human disease cases 1 0
MO, St Louis Non-human activity 0 0
MO, Taney Non-human activity 0 0
MO, St Louis City Human disease cases 1 1
NE, Box Butte Human disease cases and non-human activity 1 0
NE, Chase Non-human activity 0 0
NE, Clay Human disease cases 1 0
NE, Dawson Non-human activity 0 0
NE, Garden Non-human activity 0 0
NE, Keith Human disease cases 1 0
NE, Lancaster Non-human activity 0 0
NE, Phelps Non-human activity 0 0
NE, Red Willow Non-human activity 0 0
NE, Scotts Bluff Non-human activity 0 0
NE, Sheridan Non-human activity 0 0
NV, Churchill Non-human activity 0 0
NV, Clark Human disease cases and non-human activity 4 3
NV, Douglas Non-human activity 0 0
NV, Elko Non-human activity 0 0
NV, Lander Non-human activity 0 0
NV, Lincoln Non-human activity 0 0
NV, Lyon Non-human activity 0 0
NV, Washoe Non-human activity 0 0
NV, White Pine Non-human activity 0 0
NH, Merrimack Human disease cases 1 1
NM, Curry Human disease cases 1 1
NY, Ontario Human disease cases 1 1
NC, Duplin Human disease cases 1 1
NC, Durham Human disease cases 1 1
NC, Wake Human disease cases 1 1
OH, Cuyahoga Human disease cases 1 1
OK, Beckham Human disease cases 1 1
OK, Rogers Human disease cases 1 1
OR, Jackson Non-human activity 0 0
OR, Malheur Human disease cases 1 0
PA, Adams Human disease cases 1 0
PA, Chester Human disease cases 1 0
PA, Monroe Human disease cases 1 1
PA, Montgomery Human disease cases 1 0
PA, York Human disease cases 1 0
SD, Hughes Human disease cases 1 1
SD, Meade Non-human activity 0 0
SD, Stanley Human disease cases 1 1
TN, Shelby Human disease cases and non-human activity 1 0
TX, Cameron Non-human activity 0 0
TX, Castro Human disease cases 2 2
TX, Cottle Human disease cases 1 1
TX, El Paso Non-human activity 0 0
TX, Floyd Human disease cases 1 1
TX, Galveston Human disease cases and non-human activity 1 1
TX, Hale Human disease cases 1 1
TX, Harris Human disease cases and non-human activity 14 8
TX, Hidalgo Human disease cases 1 1
TX, Hockley Human disease cases 1 1
TX, Hunt Non-human activity 0 0
TX, Jefferson Non-human activity 0 0
TX, King Human disease cases 1 1
TX, Kleberg Human disease cases and non-human activity 1 1
TX, Lamb Human disease cases 1 1
TX, Lubbock Human disease cases and non-human activity 4 3
TX, Lynn Human disease cases 1 1
TX, Matagorda Human disease cases 1 1
TX, Nueces Human disease cases and non-human activity 3 3
TX, Parmer Human disease cases 1 1
TX, Potter Human disease cases 1 1
TX, Randall Human disease cases and non-human activity 2 2
TX, Swisher Human disease cases 1 1
TX, Tarrant Human disease cases 1 0
TX, Upton Human disease cases 1 1
TX, Wichita Non-human activity 0 0
TX, Willacy Human disease cases 1 1
UT, Salt Lake Human disease cases 1 1
UT, Utah Non-human activity 0 0
UT, Washington Non-human activity 0 0
WA, Benton Non-human activity 0 0
WA, Franklin Human disease cases 1 1
WA, King Human disease cases 1 1
WI, Dane Human disease cases 1 1
WY, Campbell Human disease cases 1 0
AL, Colbert Non-human activity 0 0
AL, Lee Human disease cases 1 1
AL, Limestone Human disease cases 1 1
AL, Mobile Human disease cases and non-human activity 1 0
AL, Tuscaloosa Human disease cases 1 1
AZ, Cochise Human disease cases and non-human activity 1 0
AZ, Graham Non-human activity 0 0
AZ, Greenlee Non-human activity 0 0
AZ, La Paz Human disease cases and non-human activity 1 1
AZ, Maricopa Human disease cases and non-human activity 74 58
AZ, Mohave Human disease cases 1 0
AZ, Pima Human disease cases and non-human activity 4 3
AZ, Pinal Human disease cases and non-human activity 4 1
AZ, Santa Cruz Non-human activity 0 0
AZ, Yuma Non-human activity 0 0
AR, Columbia Non-human activity 0 0
AR, Crawford Human disease cases 1 1
AR, Garland Human disease cases 2 2
AR, Izard Human disease cases 1 1
AR, Jefferson Human disease cases 3 3
AR, Lawrence Human disease cases 2 2
AR, Lee Human disease cases 1 1
AR, Saline Human disease cases 1 1
AR, Sebastian Human disease cases 1 1
AR, Sharp Human disease cases 1 1
AR, Stone Human disease cases 1 1
AR, Woodruff Human disease cases 1 1
CA, Butte Human disease cases and non-human activity 1 0
CA, Fresno Human disease cases and non-human activity 13 12
CA, Imperial Human disease cases and non-human activity 2 2
CA, Inyo Non-human activity 0 0
CA, Kern Human disease cases and non-human activity 10 7
CA, Kings Human disease cases and non-human activity 2 2
CA, Los Angeles Human disease cases and non-human activity 6 6
CA, Madera Human disease cases and non-human activity 1 1
CA, Marin Human disease cases 2 1
CA, Merced Non-human activity 0 0
CA, Napa Non-human activity 0 0
CA, Orange Human disease cases and non-human activity 1 1
CA, Placer Non-human activity 0 0
CA, Riverside Human disease cases and non-human activity 1 0
CA, Sacramento Human disease cases 3 2
CA, San Bernardino Non-human activity 0 0
CA, San Joaquin Human disease cases and non-human activity 1 0
CA, Shasta Non-human activity 0 0
CA, Sonoma Human disease cases 1 1
CA, Stanislaus Human disease cases and non-human activity 11 10
CA, Tulare Human disease cases and non-human activity 4 4
CA, Ventura Human disease cases 1 1
CA, Yolo Human disease cases and non-human activity 2 0
CA, Yuba Non-human activity 0 0
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Limitations of ArboNET data
Surveillance data have several limitations that should be considered when using and interpreting the data.
1. Under-reporting is a limitation common to all surveillance systems that rely on healthcare providers to consider the disease as a possible diagnosis in a patient, obtain the appropriate laboratory test, and report confirmed cases to public health authorities.
2. Cases of mild illness (non-neuroinvasive disease) are more likely to be underreported compared to more severe disease (neuroinvasive) cases. The degree of underreporting varies by disease awareness and healthcare-seeking behavior in any area. Surveillance data for non-neuroinvasive disease should not be used to make comparisons of disease activity between different locations or over time.
3. Surveillance data are reported by county of residence, not the location (county or state) of exposure.
4. Non-human surveillance is conducted variably across the country. Absence of non-human activity reported to CDC should not be interpreted as no risk.
5. There is a lag in case reporting to CDC and states and territories may publish surveillance data on different schedules than CDC.
On This Page
* View the historic data
* Cumulative data for 2003-2023
* Explore human data for 2003-2023
* Explore county level data for 2003-2023
* Limitations of ArboNET data
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