Table 1 West Nile virus infection and weather for Cook and DuPage county from 2002 to 2008.
YEAR | Average mosquito infection (MIR) | Percent Culex mosquito pools positive | Number human cases illness | Annual precipitation in cm (difference from average) | Degree weeks at week 35 base = 22 C |
|---|---|---|---|---|---|
2002 | Â | Â | 686 | 85.7 (-9.4) | 30.0 |
2003 | Â | Â | 23 | 88.6 (-6.5) | 15.2 |
2004 | 2.6 | 12% | 28 | 88.2 (-6.9) | 6.1 |
2005 | 4.5 | 19% | 182 | 65.2 (-29.9) | 31.2 |
2006 | 4.0 | 17% | 129 | 117.8 (22.7) | 25.7 |
2007 | 2.0 | 7.6% | 53 | 100.1 (5.0) | 17.9 |
2008 | 1.3 | 6.5% | 9 | 126.6 (31.5) | 12.5 |