Historical West Nile Virus Activity in San Diego County
| Year (click link for map) | Mosquito Batches | Birds | Horses | Humans* | Sentinel Chickens** | Total Source Positives |
| 2023 | 1 | 14 | 0 | 0 | 0 | 15 |
| 2022 | 0 | 0 | 0 | 3 | - | 3 |
| 2021 | 0 | 1 | 0 | 3 | - | 4 |
| 2020 | 2 | 1 | 0 | 1 | - | 4 |
| 2019 | 0 | 2 | 0 | 3 | - | 5 |
| 2018 | 3 | 1 | 0 | 2 | - | 6 |
| 2017 | 9 | 43 | 1 | 2 | - | 55 |
| 2016 | 99 | 266 | 1 | 22 | 9 | 397 |
| 2015 | 49 | 367 | 1 | 44 | 12 | 473 |
| 2014 | 2 | 41 | 3 | 13 | 6 | 65 |
| 2013 | 0 | 9 | 0 | 0 | 0 | 9 |
| 2012 | 0 | 1 | 0 | 2 | 0 | 3 |
| 2011 | 1 | 0 | 0 | 0 | 0 | 1 |
| 2010 | 1 | 2 | 0 | 0 | 0 | 3 |
| 2009 | 5 | 38 | 0 | 4 | 5 | 52 |
| 2008 | 40 | 563 | 5 | 36 | 15 | 659 |
| 2007 | 5 | 118 | 4 | 15 | 1 | 143 |
| 2006 | 0 | 19 | 3 | 1 | 0 | 23 |
| 2005 | 0 | 162 | 0 | 1 | 0 | 163 |
| 2004 | 0 | 34 | 2 | 2 | 0 | 38 |
| 2003 | 0 | 5 | 1 | 0 | 0 | 6 |
* Cases as reported by CDPH, includes non-locally acquired cases, last updated 1/3/2023
** Use of sentinel chickens was discontinued in 2017
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