The disease surveillance program serves as an early warning system in the detection of mosquito-borne viruses that can infect people and animals.

The District uses the following factors to assess health risk in your community:

  • Higher-than-average daily temperatures
  • Mosquito Population Monitoring – Using traps set up in every community
  • Mosquito Testing for Diseases
  • Dead Birds – A CA state program: Dead birds help determine spread of West Nile virus
  • Sentinel Chickens – Chickens develop antibodies to West Nile virus, which can be detected by testing.

Using these measurements, the District is able to protect your health by responding appropriately to mosquito-borne disease threats.


Yearly Summary (2008-2016)

Human cases reported for LA County by Los Angeles County Department of Public Health


Year-to-Date Statistics for 2017

WNV+ = Number of West Nile virus positive samples confirmed

  • City or Community
  • WNV+
  • Artesia
  • 1
  • Bellflower
  • 1
  • Cerritos
  • 1
  • La Mirada
  • 2
  • Lakewood
  • 1
  • Long Beach
  • 1
  • Los Angeles 90031
  • 1
  • Rowland Heights
  • 1
  • Santa Fe Springs
  • 1
  • Tarzana (LA)
  • 1
  • Toluca Lake (LA)
  • 1
  • Winnetka (LA)
  • 1
  •  
  • WNV+ total: 13
  • City or Community
  • WNV+
  • Glassell Park
  • 1
  • Tarzana
  • 1
  • West Hills
  • 1
  • Whittier
  • 1
  •  
  • WNV+ total: 4
  • City or Community
  • Date of 1st Detection
  • Number of WNV+
  • None at this time
  •  
  •  
  • Number of WNV+ total: 0