vector-borne disease section

CDPH Monthly Update on Number of Chikungunya Cases in California

June 1, 2026

The following table provides the number of symptomatic chikungunya cases in California residents from 2016 to 2026. All chikungunya cases reported in California have been associated with travel. There have been zero locally acquired infections reported in California.

Chikungunya cases in California, 2016–2026 (as of June 1, 2026)

County	2026	2025	2016-2024 Average (Range)
Total	1	24	28 (5, 60)
Alameda	0	4	4 (0, 10)
Contra Costa	0	2	2 (0, 5)
Fresno	0	0	0 (0, 3)
Kern	0	0	0 (0, 1)
Los Angeles	0	4	5 (0, 9)
Marin	0	0	0 (0, 1)
Nevada	0	0	0 (0, 1)
Orange	0	4	1 (0, 2)
Placer	0	0	0 (0, 1)
Riverside	0	0	1 (0, 2)
Sacramento	0	1	1 (0, 4)
San Bernardino	0	0	0 (0, 2)
San Diego	0	1	2 (0, 6)
San Francisco	1	1	1 (0, 3)
San Joaquin	0	0	0 (0, 1)
San Luis Obispo	0	0	0 (0, 1)
San Mateo	0	0	1 (0, 4)
Santa Barbara	0	2	0 (0, 1)
Santa Clara	0	2	7 (1, 14)
Santa Cruz	0	1	0 (0, 1)
Solano	0	0	0 (0, 1)
Sonoma	0	1	0 (0, 1)
Stanislaus	0	0	0 (0, 1)
Sutter	0	0	0 (0, 1)
Tehama	0	0	0 (0, 1)
Ventura	0	1	0 (0, 1)