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Table 1 West Nile virus cases by year and region.

From: Landscape, demographic, entomological, and climatic associations with human disease incidence of West Nile virus in the state of Iowa, USA

Year Total Cases Eastern Cases (%) Western Cases (%) Mean Week Median Week
2002 55 25 (45.5) 30(54.5) 37.18 37
2003 147 32 (21.8) 115 (78.2) 35.02 35
2004 23 11 (47.8) 12 (52.2) 33.83 35
2005 37 6 (16.2) 31 (83.8) 35.38 36
2006 36 11 (30.6) 25 (69.4) 32.08 33