Westnile.ca.gov

Westnile.ca.gov West Nile Virus information from the CA Dept. of Public Health https://westnile.ca.gov

12/13/2025

There were 2 new WNV positive human cases reported in California this week from Kern County.

10 WNV-related fatalities have been reported to CDPH this year from 8 jurisdictions: Butte (1), Fresno (2), Kings (1), Los Angeles (2), Placer (1), San Joaquin (1), Santa Clara (1), and Tulare (1).
110 human cases from 23 counties have tested positive for WNV in 2025.

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12/05/2025

There was 1 new WNV positive sentinel chicken reported in California this week from Los Angeles County.

65 sentinel chickens from 8 counties have tested positive for WNV in 2025.

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12/05/2025

There were 5 new WNV positive human cases reported in California this week from the following counties: Colusa (1), and Los Angeles (4). This is the first WNV positive human case from Colusa County this year.

10 WNV-related fatalities have been reported to CDPH this year from 8 jurisdictions: Butte (1), Fresno (2), Kings (1), Los Angeles (2), Placer (1), San Joaquin (1), Santa Clara (1), and Tulare (1).

108 human cases from 23 counties have tested positive for WNV in 2025.

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11/21/2025

There were 2 new WNV positive dead birds reported in California this week from San Diego County.

154 dead birds from 21 counties have tested positive for WNV in 2025.

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11/21/2025

There were 3 new WNV positive human cases reported in California this week from the following counties: Merced (1), and Orange (2).

9 WNV-related fatalities have been reported to CDPH this year from 8 jurisdictions: Butte (1), Fresno (2), Kings (1), Los Angeles (1), Placer (1), San Joaquin (1), Santa Clara (1), and Tulare (1).

102 human cases from 21 counties have tested positive for WNV in 2025.

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11/15/2025

There was 1 new WNV positive sentinel chicken reported in California this week from Los Angeles County.

64 sentinel chickens from 8 counties have tested positive for WNV in 2025.

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11/15/2025

There were 5 new WNV positive mosquito samples reported in California this week from the following counties: Los Angeles (3), San Bernardino (1), and San Diego (1).

2,755 mosquito samples from 27 counties have tested positive for WNV in 2025.

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11/15/2025

There was 1 new WNV positive dead bird reported in California this week from San Diego County.

152 dead birds from 21 counties have tested positive for WNV in 2025.

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11/15/2025

There were 7 new WNV positive human cases reported in California this week from the following counties: Fresno (2), Kern (1), Los Angeles (3), and Solano (1). This is the first WNV positive human case from Solano County this year.

9 WNV-related fatalities have been reported to CDPH this year from 8 jurisdictions: Butte (1), Fresno (2), Kings (1), Los Angeles (1), Placer (1), San Joaquin (1), Santa Clara (1), and Tulare (1).

99 human cases from 21 counties have tested positive for WNV in 2025.

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11/07/2025

There were 2 new WNV positive sentinel chickens reported in California this week from Los Angeles County.

63 sentinel chickens from 8 counties have tested positive for WNV in 2025.

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11/07/2025

There were 20 new WNV positive mosquito samples reported in California this week from the following counties: Los Angeles (8 ), Orange (5), Riverside (1), San Diego (5), and Tulare (1).

2,750 mosquito samples from 27 counties have tested positive for WNV in 2025.

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11/07/2025

There were 8 new WNV positive human cases reported in California this week from the following counties: Fresno (3), Glenn (1), Kern (2), Orange (1), and Sutter (1). This is the first indication of WNV from Glenn County this year.

8 WNV-related fatalities have been reported to CDPH this year from 8 jurisdictions: Butte (1), Fresno (1), Kings (1), Los Angeles (1), Placer (1), San Joaquin (1), Santa Clara (1), and Tulare (1).

92 human cases from 20 counties have tested positive for WNV in 2025.

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