West Nile virus Facts
- West Nile virus is the most common mosquito-borne disease that affect residents in Los Angeles County
- Public health agencies detect West Nile virus every year in L.A. County. This means the virus is found naturally in our city environments, which means it's endemic.
- Our agency uses routine traps to colect samples of mosquitoes. The mosquito samples are tested for a mosquito-borne diseases, such as West Nile virus. In addition, dead birds, which can carry West Nile virus, are submitted for testing.
2020 West Nile Virus Activity
Last update: 11/6/20
West Nile Virus Positive Mosquito Samples
A sample is a random collection of 10-50 mosquitoes from a trap
|City/Community||Number of WNV+ Mosquito Samples||Date of first posting|
|Bassett (Unincorporated L.A. County)||7||8/24|
|Unincorporated L.A. County area around Fairgrove Nursery||1||10/1|
|West Puente Valley (Unincorporated L.A. County)||2||8/10|
West Nile Virus Positive Dead Birds
People report dead birds they observe in their community.
|City/Community||Number of WNV+ dead birds||Date of first report|