Volume 7, Number 4—August 2001
THEME ISSUE
West Nile Virus
West Nile Virus
Serologic Evidence for West Nile Virus Infection in Birds in the New York City Vicinity During an Outbreak in 1999
Nicholas Komar*
, Nicholas A. Panella*, Joseph E. Burns*, Stephen W. Dusza*, Tina M. Mascarenhas*, and Thomas O. Talbot†
, Nicholas A. Panella*, Joseph E. Burns*, Stephen W. Dusza*, Tina M. Mascarenhas*, and Thomas O. Talbot†
Table 4
Estimated relative abundance of six bird species with West Nile virus seroprevalence and estimated relative number of infections, suburban northeastern Queens
| Bird | Relative | WN virus Ab | Relative no. of | |
|---|---|---|---|---|
| species | abundance | prevalence [95% CI] | infections (%)a | Percentage rangeb |
| House Sparrow | 6,000 | 0.60 | 4186 | 82 – 97 |
| [0.36-0.81] | (92) | |||
| Rock Dove | 1,000 | 0.27 | 314 | 3 – 16 |
| [0.15-0.41] | (7) | |||
| Mallard | 60 | 0.06 | 4 | <1 - <1 |
| [0.002-0.35] | (<1) | |||
| Canada Goose | 60 | 0.29 | 20 | <1 – 2 |
| [0.04-0.71] | (<1) | |||
| Domestic Chicken | 3 | 0.63 | 2 | <1 - <1 |
| [0.55-0.71] | (<1) | |||
| Domestic Goose | 1 | 0.86 | 1 | <1 - <1 |
| [0.42-1.00] | (<1) |
Ab: antibody; CI: confidence interval.
aAdjusted relative to Domestic Goose.
bThis range is determined as follows for each species. For lower bound, the lowest bound of the seroprevalence CI is used to estimate the total relative number of infections; the upper bound of this CI is used for all other species. The converse is assumed for the calculation of the upper bound of the percentage.
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