Influenza in the US: Now Widespread

According to the CDC, influenza activity in the United States has now become widespread. The maps below demonstrate this (states appearing in brown have widespread flu activity; you can see how activity has ramped up across most of the middle of the country over the course of a single week).

This is shaping up to be at least a moderately severe influenza season; only time will tell how this season will compare to others. As this year's (Northern hemisphere) vaccine pretty closely matches the circulating flu strains detected to date, it is not too late to get a flu shot.