Table 1.
Summary results for birds grouped by infecting WNV genotype*
| Species† | WNV genotype | No. | Mean peak viremia‡ | Geometric mean antibody titer§ | PRNT90 antibody titer range | No. (%) WNV RNA positive¶ |
|---|---|---|---|---|---|---|
| House Finch | NY99 | 5 | 7.1 | 1:557 | 1:320–1:1,280 | 3 (60) |
| TM 171-03 ppl | 10 | 3.9 | 1:43 | 1:5–1:160 | 5 (50) | |
| Naturally infected | 1 | NT | 1:1280 | 1:1,280 | 0 | |
| Overall | 16 | 5 | 1:118 | 1:5–1:1,280 | 8 (50) | |
| House Sparrow | NY99 | 2 | 6.2 | 1:160 | 1:80–1:320 | 1 (50) |
| TM 171-03 ppl | 9 | 2.9 | 1:174 | < 1:5–1:1,280 | 3 (33) | |
| TM 171-03 pp5 | 3 | 5.0 | 1:254 | 1:80–1:640 | 1 (33) | |
| BIRD 1153 | 2 | 6.2 | 1:320 | 1:160–1:640 | 0 | |
| BIRD 1461 | 4 | 5.8 | 1:190 | 1:40-1:640 | 0 | |
| NY99 point mutant | 6 | 3.6 | 1:202 | 1:40–1:640 | 4 (67) | |
| Naturally infected | 9 | NT | 1:101 | < 1:5–1:320 | 4 (44) | |
| Overall | 35 | 4.3 | 1:169 | < 1:5–1:1,280 | 13 (37) | |
| Western Scrub-Jay | Naturally infected | 2 | NT | 1:113 | 1:40–1:320 | 2 (100) |
*
WNV = West Nile virus.
†
House Finch (Carpodacus mexicanus); House Sparrow (Passer domesticus); Western Scrub-Jay (Aphelocoma californica).
‡
Log10 plaque-forming units/mL of serum. Viremia titers of naturally infected birds were unavailable and not tested (NT).
§
Tested by plaque reduction neutralization test (PRNT). Shown is the highest serum dilution at which 90% of > 75 plaque-forming units of WNV were neutralized. The lowest serum dilution tested was 1:5.
¶
Spleen and kidney tissue were screened for WNV RNA by using quantitative reverse transcription–polymerase chain reaction and primers and probe specific for the envelope region of the viral genome (WN1).