West Nile Virus Activity 2024
West Nile Virus Facts
- West Nile virus is the most common mosquito-borne disease that affects 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 collect samples of mosquitoes. The mosquito samples are tested for mosquito-borne diseases, such as West Nile virus. In addition, dead birds, which can carry West Nile virus, are submitted for testing.
Year-to-Date Statistics for 2024
2024 WNV+ Mosquito Samples
A sample is a random collection of 10-50 mosquitoes from a trap. Positive mosquito samples from routine and randomized trapping provide insight into the spread of West Nile virus.
| City/Community | Date of First Detection | Positives |
|---|---|---|
| Alhambra | 08/27/24 | 3 |
| Azusa | 08/06/24 | 1 |
| Baldwin Park | 07/11/24 | 6 |
| Bradbury | 07/30/24 | 1 |
| Claremont | 08/13/24 | 1 |
| Covina | 09/04/24 | 4 |
| El Monte | 08/20/24 | 1 |
| Glendora | 07/23/24 | 2 |
| Irwindale | 07/23/24 | 3 |
| La Puente | 07/30/24 | 4 |
| Monterey Park | 07/30/24 | 3 |
| Pomona | 08/20/24 | 1 |
| Rosemead | 08/27/24 | 5 |
| San Gabriel | 09/10/24 | 2 |
| Temple City | 10/08/24 | 1 |
| West Covina | 08/27/24 | 10 |
| Total # of Positive Mosquito Samples this Year | 48 |
2024 WNV+ Dead Birds
People report dead birds they observe in their community. Positive dead birds are an indication West Nile virus is widespread in the region.
| City/Community | Date of First Detection | Positives |
|---|---|---|
| Baldwin Park | 08/13/24 | 1 |
| West Covina | 09/12/24 | 2 |
| Total # of Positive Dead Birds This Year | 3 |
Take a look at mosquito disease activity throughout California using the VectorSurv Map!
To experience the entire site, visit: VectorSurv.org
