Google Earth last week introduced new functionality that allows one to map events against time. Clearly this is the ideal way to view the spread of avian flu worldwide, so I have adapted my existing flu maps to it, and updated them to this week.
You WILL NOT be able to view these maps correctly using the standard Google Earth client. You MUST FIRST install the latest GE 4.0 beta — download link here. Once you have done that, the new link for the time-enabled maps is this one.
Once you have downloaded the map inside the new version of Google Earth, you will see a time bar at the top of the screen (see screenshot below). Click the button at the right-hand side of this bar to view the time series.