Michigan and Detroit in particular had a spike in West Nile Virus (WNV) in 2012. The spike was related to a handful of urban environments in cities. Issues of impervious surfaces, poor drainage, and high degrees of dumping can create habitats for mosquitoes to breed easily.
Using the data available from the Improve Detroit (SeeClickFix) app, I estimated possible areas of risk due to high levels of dumping and blocked catch basins. The data is obviously limited by self-reported issues by residents, but it is well distributed and fairly robust for almost the entire city.