That would have been last flu season, which is about as recent as evaluations of flu surveillance systems get. Also, I saw a presentation given at an infectiou

That would have been last flu season, which is about as recent as evaluations of flu surveillance systems get. Also, I saw a presentation given at an infectious disease conference...less than a month ago. Google Flu Trends appears to really break down at small spatial scales, like a single city. Unfortunately, Google is also super opaque about how it works, so it's hard to tune.