Just adding a little on the West Nile Virus column (http://www.straightdope.com/mailbag/mwestnile.html) a few days ago:
Apparently a vaccine could be in the pipes, utilising a mostly harmless australian virus related to the WNV. See Scientific American Article (http://www.scientificamerican.com/article.cfm?articleID=0009E6D8-EAD6-1CCF-B4A8809EC588EEDF&catID=1)
Just my little bit to fight ignorance 