Is proximity to known outbreaks of WNV a factor in its spread? Looking at the map in the following figure , describe geographic factors that seem to influence the spread of WNV. Explain.

Year ............................ States Reporting WNV
1999 ................................................. 4
2000 ............................................... 12
2001 ............................................... 28
2002 ............................................... 44

Transcribed Image Text:

West nile virus in the united states, 1999-2001 D.C 1999-2001 2000-2001* * vermont reported WNV infection in Pattern indicates human cases 2001 2000, but not in 2001.