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CDPH Monthly Update on Number of Chikungunya Infections in California 

March 1, 2025

​The following table provides the number of travel-associated infections with chikungunya virus in California residents from 2016 to 2025. Travel-associated infections include people exposed through travel to an area affected by chikungunya. All chikungunya cases reported in California have been associated with travel; there have been zero locally acquired infections reported in California.

​Travel-associated chik​ungunya infections in California, 2016–2025 (as of March 1, 2025)​​


​​County
​2016
​2017
​2018
​2019
​2020
​2021
​2022
​2023
​2024
​2025
​Total
​60
​32
​26
​34
​5
​7
​24
​23
​33
​1
​Alameda
​10
​3
​2
​5
​0
​0
​4
​2
​5
​1
​Contra Costa
​2
​3
​1
​1
1
​0
​0
​1
​5
​0
​Fresno
3​​0
​0
​0
​0
​0
​0
​1
​0
​0
​Kern
​0
​0
​0
​1
​0
​0
​0
​0
​1
​0
​Los Angeles
​9
​9
​8
​2
​1
​0
​8
​4
​2
​0
​Marin
0​​0
​0
​1
​0
​1
​1
​0
​0
​0
​Nevada
​0
​0
​0
​1
​0
​0
​0
​0
​0
​​0​
​Orange
​1
​2
​0
​2
​1
​0
​1
​1
​1
​0
​Placer
0​​0
​0
​0
​0
​0
​0
​0
​1
​0
​Riverside
​1
​0
​0
​2
​0
​0
​1
​2
​2
​0
Sacramento
​1
​1
​1
​1
​0
​0
​2
​4
​2
​0
​San Bernardino
2
​0
0
​0
​1
0​​0
​0
​0
​0
​San Diego
​6
​2
​5
​3
​0
​1
​2
​0
​2
​0
​San Francisco
3​​0
​1
​3
​0
​1
​0
​0
​0
​0
​San Joaquin
​0
​1
​0
​0
​0
​0
​0
​0
​1
​0
​San Luis Obispo
0​​0
​0
​1
​​0
​0
​0
​0
​1
​0
​San Mateo
4​​1
​1
​1
​0
​0
​1
​1
​0
​0
​Santa Barbara
0
​0
​0
​1
​0
​0
​0
​1
​0
​0
​Santa Clara
​14
​10
​5
​9
​1
​3
​4
​3
​9
​0
Santa Cruz
​1
​0
​0
​0
​0
​0
​0
​1
​0
​0
​Solano
1​​0
​0
​0
​0
​0
​1
​0
​1
​0
​Sonoma
0​​0
​0
​0
​0
​0
​0
​1
​0
​0
​Stanislaus
0​​0
​1
​0
​0
​0
​0
​1
​0
​0
​Sutter
​1
​0
​0
​0
​0
​0
​0
​0
​0
​0
​Tehama​
​0
​0
​1
​0
​0
​0
​0
​0
​0
​0
​​Ventura
1​​0
​0
​0
​0
​0
​0
​0
​0
​​0

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