West Nile Virus in San Diego County
West Nile virus (WNV) is a disease transmitted to humans, birds, horses, and other animals, by infected mosquitoes. Mosquitoes get the disease from feeding on infected birds and can later pass it on when they bite animals or humans.
Learn more about West Nile virus here
Vector Control Program staff monitor WNV by trapping, batching, and testing mosquitoes and by testing dead birds.
Current WNV activity is given below.
Current WNV Activity
For more information on a specific source click on the source name (hyperlink) below
| Source | Number of Positives to Date (2023) | |
| Birds | 10 | |
| Mosquito Batches | 1 | |
| Horses | 0 | |
| Humans | locally acquired: 0 | non-locally acquired: 0 |
| Total Local Positives | 11 | |
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