"Mosquito Aerial Spray Programs Endanger Human Health, Don’t Work."  This is an article we wrote for the California Progress Report, posted on August 2, 2012, explaining that the spray is dangerous and does not slow the transmission of WNv to humans.  Moreover, the serious human case count (neuroinvasive cases) for all of Sacramento and Yolo counties for 2011 and 2012 is a grand total of 1.  This is far below the "dozens, if not hundreds, of cases of serious neuroinvasive disease that often result in permanent disability and can conclude in death" that vector control and CDPH projected we would have "without intervention" when WNv first became of concern in the region in 2005.  The evidence is strong that the aerial spray has not provided "intervention," which calls into very serious question the staggering amount of money being spent on an ineffective program.

Here is the article with more complete references.