From: A comparison of six analytical disease mapping techniques as applied to West Nile Virus in the coterminous United States
Year
# states reporting cases
# human cases
# human deaths
1999
4
62
7
2000
21
2
2001
10
50
5
2002
44
4,156
284
2003
45
9,862
264
2004
40
2,539
100