West Nile Virus Activity 2020
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.
Our agency reports data related to mosquitoes. Human cases are reported by the L.A. County Department of Public Health and Pasadena Health Department.
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 |
|---|---|---|
| Alhambra | 4 | 10/8 |
| Arcadia | 1 | 10/16 |
| Azusa | 1 | 9/17 |
| Baldwin Park | 2 | 9/17 |
| Bassett (Unincorporated L.A. County) | 7 | 8/24 |
| Claremont | 2 | 9/4 |
| Covina | 2 | 10/1 |
| El Monte | 2 | 8/24 |
| La Puente | 1 | 9/4 |
| Monrovia | 1 | 8/28 |
| Monterey Park | 3 | 9/24 |
| Pomona | 3 | 8/5 |
| Rosemead | 12 | 8/10 |
| San Gabriel | 3 | 8/28 |
| Temple City | 1 | 10/16 |
| Unincorporated L.A. County area around Fairgrove Nursery | 1 | 10/1 |
| Walnut | 1 | 9/17 |
| West Covina | 4 | 8/28 |
| 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 |
|---|---|---|
| La Verne | 1 | 8/17 |
| Monterey Park | 1 | 11/6 |
| West Covina | 1 | 10/12 |
