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CDPH Monthly Update on Number of Dengue Cases in California

December 1, 2025 

The following table provides the number of symptomatic dengue cases 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. 

  • To date in 2025 there have been six locally acquired cases reported in California. ​There were two locally acquired cases reported in California in 2023 and 18 in 2024. Locally acquired dengue cases are indicated by an asterisk (*) in the table below. ​​

​​Dengue virus cases in California, 2016–2025 (as of December 1, 2025) ​


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

​​2025

​Total
​201
​132
​107
​267
​86
​33
​128
​250
​720
​148
​Alameda
​16
​19
​7
​23
​5
​2
​12
22
​​52
​4
​Butte
​0
​1
​0
​2
​0
​0
​0
​1
​1
0​​
​Colusa
​0
​0
​0
​0
​0
​0
​0
​0
​0
​1
​Contra Costa
​10
​4
​6
​16
​1
​0
​3
​4
​27
​​4
​El Dorado
​1
​2
​0
​1
​1
​0
​0
​0
​1
​0
​Fresno
6​​2
​0
​2
​1
​1
​2
​4
​8
​2
​Humboldt
1​​1
​0
​0
​1
​0
​0
​0
​1
​0
​Imperial
0​​0
​0
​0
​0
​0
​0
​1
​2
​1
​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
​1
​Los Angeles
​52
20
​28
55
24
5
35
78, 2*
​​238, 14*
​42, 6*
​Madera
0​​0
​0
​1
​0
​0
​0
​0
​0
​0
​Marin
4​​2
​0
​3
​1
​0
​0
​3
​2
​3
​Mendocino
1​​0
​0
​0
​0
​0
​0
​1
​0
​1
​Merced
​0
​0
​0
​1
​1
​0
​0
​1
​0
​1
​Mono
​0
​0
​0
​0
​0
​0
​0
​0
​1
​0
​Monterey
1​​3
​0
​1
​0
​0
​1
​1
​6
2
​Napa
0​​0
​0
​0
​2
​0
​1
​0
​3
​1
​Nevada
0​​1
​0
​0
​0
​0
​0
​0
​0
​0
​Orange
​12
​10
​12
​20
​8
​5
​6
​18
​47
12
​Placer
2​​1
​1
​3
​0
​0
​1
​0
​3
​1
​Riverside
​3
​1
​1
​5
​3
​0
​3
​4
​32
​4
​Sacramento
​3
​6
​1
​10
​1
​3
​6
​3
​​17
​8
​San Benito
​0
​0
​1
​0
​0
​0
​0
​1
​2
​0
​San​ Bernardino
​7
​3
​0
​6
​3
​0
​0
​5
​23, 1*
6
​San Diego
​23
​8
​9
​26
​4
​3
​14
​25
​61, 3*
​12
​San Francisco
4​​4
​3
​14
​1
​0
​6
​12
​20
​8
​San Joaquin
​3
​2
​0
​2
​2
​2
​1
​4
​11
​2
​San Luis Obispo
​1
​1
​1
​5
​0
​0
​1
​1
​1
​1
​San Mateo
8​​3
​7
​8
​4
​1
​7
​8
​16
10
​Santa Barbara
5​​1
​0
​0
​0
​1
​2
​3
​5
​1
​Santa Clara
​20
​24
​15
​41
​7
​8
​17
​29
​46
​0
​Santa Cruz
​1
​2
​1
​1
​1
​0
​0
​1
​​6
​3
​Shasta
​0
​0
​1
​0
​0
​0
​1
​0
​0
​3
​Solano
​3
​4
​2
​2
​0
​2
​2
​0
​10
​1
​Sonoma
​2
​1
​0
​4
​4
​0
​0
​4
9
​1
​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
​1
​Tuolumne
1​​0
​1
​1
​0
​0
​0
​0
​0
0​
​Ventura
3​​3
​2
​6
​3
​0
​1
​1
​15
​3
​Yolo
1​​1
​1
​4
​1
​0
​4
​1
​10
​2
Yuba
0​
​0
​1
​0
​0
​0
​0
​0
​0
​0

​

*Dengue infection acquired in California

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