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Volume 11, Number 9—September 2005

Dead Crow Density and West Nile Virus Monitoring, New York

Millicent Eidson*Comments to Author , Kate Schmit*, Yoichiro Hagiwara*, Madhu Anand*, P. Bryon Backenson*, Ivan Gotham*, and Laura Kramer*
Author affiliations: *New York State Department of Health, Albany, New York, USA

Main Article

Table 2

Risk for West Nile virus disease in counties with elevated dead crow density (DCD) in the 2 weeks before disease onset*

Counties with elevated DCD† 2001 RR (95% CI) 2002 RR (95% CI) 2003 RR (95% CI) 2001–2003 RR (95% CI)
2 weeks before onset 8.6 (1.8–41.8) 2.2 (1.1–4.6) 5.4 (2.1–14) 3.5 (2.0–6.0)
1 or 2 weeks before onset 7.9 (2.9–19.1) 2.3 (1.1–4.8) 6.5 (2.6–16.3) 3.8 (2.2–6.6)
0, 1, or 2 weeks before onset 7.6 (1.6–36.8) 2.0 (0.95–4.4) 5.3 (2.2–12.8) 3.4 (1.9–5.9)

*Versus residents of counties without elevated DCD in the previous 2 weeks; risk is calculated for exposure to elevated DCD only 2 weeks before, 1 or 2 weeks before, and during the same week or 1 or 2 weeks before week of onset. SAS provides risk estimates by 2 methods; because zero values occur in 2×2 tables for some weeks, we report results by the adjusted logit method, which uses a 0.5 correction for zero-value cells. RR, relative risk; CI, confidence interval.
†Weekly DCD >0.1.

Main Article

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Page updated: April 23, 2012
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