Table 1. Mosquito pools containing WNV collected during 2004–2012 California epidemics.
| Isolate | Region | Collection date | Culex species | Ct | Titer a |
|---|---|---|---|---|---|
| GRLA-04-1624 | Encino, Los Angeles County | 7/28/2004 | quinquefasciatus | 18.0 | 8.9±0.03 |
| SAYO-05-912 | Citrus Heights, Sacramento County | 8/19/2005 | pipiens | 19.8 | 9.0±0.04 |
| KERN-07-291 | Bakersfield, Kern County | 7/27/2007 | quinquefasciatus | 23.8 | 8.9±0.01 |
| GRLA-11-6246 | Los Angeles, Los Angeles County | 9/02/2011 | quinquefasciatus | 19.2 | 9.3±0.02 |
| SAYO-12-772 | Sacramento, Sacramento County |
5/23/2012 | tarsalis | 18.5 | 9.0±0.11 |
a Mean±SEM infectious WNV titer of replicate Vero cell culture supernatants indicated as log10 plaque forming units (PFU) per mL.