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Google just launched an updated version of Google Flu Trends, a service that predicts flu trends by tracking flu-related queries on the company's search engine. Until now, Google only showed aggregate data for states in the United States. Starting today, Flu Trends will show data down to the city level for 121 cities. As Google notes in today's announcement, this update was timed to coincide with National Influenza Vaccination Week.

Google just announced a major expansion of its Flu Trends program which monitors searches for Flu-related symptoms on Google's search engine to predict Flu outbreaks. Until now, Google only made the data it gathered from searches in the U.S., Mexico, Australia and New Zealand available, but now, Google has expanded the product to cover 16 more countries, including Russia, Norway, Sweden, Germany, France, Poland and Spain.

Google just launched an experimental version of Flu Trends that focuses only on the current flu outbreak in Mexico. Google Flu Trends, which was launched last November, tracks and maps flu-related search queries to predict how many people in a given region actually have the flu. Google stresses that Flu Trends for Mexico is only an experimental product, and that it tries to distinguish between topical searches about the flu and searches by users who may actual experience flu symptoms. Given the current interest in the swine flu, a lot of users are obviously looking for general information about it, which could easily skew Google's algorithms.