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Volume 13, Number 11—November 2007

Dispatch

Environmental Predictors of Human West Nile Virus Infections, Colorado

Jennifer L. Patnaik*Comments to Author , Lara Juliusson*, and Richard L. Vogt*
Author affiliations: *Tri-County Health Department, Greenwood Village, Colorado, USA;

Main Article

Table 1

Number and proportion of human infections successfully predicted by positive environmental specimens, Tri-County Health Department, Colorado, 2003

Total no. human infections No. (%) human Infections successfully predicted by
Any environmental specimen Birds Mosquito 
pools Equines Sentinel chickens
Region
Urban (reference value) 292 202 (69.2) 176 (60.3) 51 (17.5) 35 (12.0) 3 (0.9)
Rural 112 59 (52.7)* 30 (26.8)* 28 (25.0) 21 (18.8) 1 (1.0)
Onset date†
June/July 79 28 (35.4)* 17 (21.5)* 9 (11.4)* 8 (10.1) 0
August 273 196 (71.8) 157 (57.5) 54 (19.8) 41 (15.0) 4 (1.5)
September (reference value)
47
34 (72.3)
30 (63.8)
14 (29.8)
6 (12.8)
0
Total 404‡ 261 (64.6) 206 (51.0) 79 (19.6) 56 (13.9) 4 (1.0)

*Significant at the p = 0.05 level.
†Five human case-patients had missing onset date.
‡Four human case-patients could not be geo-located.

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