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CDPH Monthly Update on Number of Dengue Infections in California

March 1, 2025 

The following table provides the number of infections with dengue virus in California residents from 2016 to 2025. Nearly all dengue cases reported in California have been associated with exposure through travel to an area affected by dengue outside of California. 

  • ​There were 18 locally acquired infections reported in California in 2024. Locally acquired dengue cases are indicated by an asterisk (*) in the table below. ​​

​​Dengue infections in California, 2016–2025 (as of March​ 1, 2025) ​


​​​County
​
​2016
​2017
​2018
​2019
​2020
​2021
​2022
​2023
​​2024

​​2025

​Total
​201
​132
​107
​267
​86
​33
​128
​250
​666
​10
​Alameda
​16
​19
​7
​23
​5
​2
​12
22
​​22
​0
​Butte
​0
​1
​0
​2
​0
​0
​0
​1
​1
0​​
​Contra Costa
​10
​4
​6
​16
​1
​0
​3
​4
​26
​0
​Colusa
​0
​0
​0
​0
​0
​0
​0
​0
​0
​​1
​El Dorado
​1
​2
​0
​1
​1
​0
​0
​0
​1
​0
​Fresno
6​​2
​0
​2
​1
​1
​2
​4
​8
​0
​Humboldt
1​​1
​0
​0
​1
​0
​0
​0
​1
​0
​Imperial
0​​0
​0
​0
​0
​0
​0
​1
​1
​0
​Kern
​0
​0
​3
​3
​1
​0
​2
​4
​​8
​0
​Kings
​0
​0
​0
​0
​0
​0
​0
​0
​3
0​
​Lake
​1
​0
​0
​0
0
0​
​0
​0
​2
​0
​Los Angeles
​52
20
​28
55
24
5
35
78, 2*
​​231, 14*
​1
​Madera
0​​0
​0
​1
​0
​0
​0
​0
​0
​0
​Marin
4​​2
​0
​3
​1
​0
​0
​3
​2
​0
​Mendocino
1​​0
​0
​0
​0
​0
​0
​1
​0
​0
​Merced
​0
​0
​0
​1
​1
​0
​0
​1
​0
​0
​Mono
​0
​0
​0
​0
​0
​0
​0
​0
​1
​0
​Monterey
1​​3
​0
​1
​0
​0
​1
​1
​6
0​
​Napa
0​​0
​0
​0
​2
​0
​1
​0
​3
​0
​Nevada
0​​1
​0
​0
​0
​0
​0
​0
​0
​0
​Orange
​12
​10
​12
​20
​8
​5
​6
​18
​47
​0
​Placer
2​​1
​1
​3
​0
​0
​1
​0
​3
​0
​Riverside
​3
​1
​1
​5
​3
​0
​3
​4
​32
​1
​Sacramento
​3
​6
​1
​10
​1
​3
​6
​3
​​15
​0
​San Benito
​0
​0
​1
​0
​0
​0
​0
​1
​2
​0
​San​ Bernardino
​7
​3
​0
​6
​3
​0
​0
​5
​23, 1*
2
​San Diego
​23
​8
​9
​26
​4
​3
​14
​25
​49, 3*
​0
​San Francisco
4​​4
​3
​14
​1
​0
​6
​12
​19
​0
​San Joaquin
​3
​2
​0
​2
​2
​2
​1
​4
​11
​0
​San Luis Obispo
​1
​1
​1
​5
​0
​0
​1
​1
​2
​1
​San Mateo
8​​3
​7
​8
​4
​1
​7
​8
​16
0​
​Santa Barbara
5​​1
​0
​0
​0
​1
​2
​3
​5
​0
​Santa Clara
​20
​24
​15
​41
​7
​8
​17
​29
​43
​0
​Santa Cruz
​1
​2
​1
​1
​1
​0
​0
​1
​​6
​0
​Shasta
​0
​0
​1
​0
​0
​0
​1
​0
​0
​1
​Solano
​3
​4
​2
​2
​0
​2
​2
​0
​9
​0
​Sonoma
​2
​1
​0
​4
​4
​0
​0
​4
10​​0
​Stanislaus
4
​2
​2
0
​2
​0
​0
​5
​8
​0
​Sutter
​0
​0
​0
​1
​3
​0
​0
​0
​​1
​0
​Tehama
1​​0
​0
​0
​0
​0
​0
​1
​1
​0
​Tulare
1​​0
​1
​0
​1
​0
​0
​2
​4
​0
​Tuolumne
1​​0
​1
​1
​0
​0
​0
​0
​0
0​
​Ventura
3​​3
​2
​6
​3
​0
​1
​1
​16
​1​
​Yolo
1​​1
​1
​4
​1
​0
​4
​1
​10
​1
Yuba
0​
​0
​1
​0
​0
​0
​0
​0
​0
​0

​

*Dengue infection acquired in California

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