Google Flu Trends for Australia

 This is from the Google Down Under blog this morning.

How does this work? (from the same website)

We have found a close relationship between how many people search for flu-related topics and how many people actually have flu symptoms. Of course, not every person who searches for "flu" is actually sick, but a pattern emerges when all the flu-related search queries are added together. We compared our query counts with traditional flu surveillance systems and found that many search queries tend to be popular exactly when flu season is happening. By counting how often we see these search queries, we can estimate how much flu is circulating in different states and countries around the world. Our results  have been published in the journal Nature.