The latest news of the scientific and operational center CDC you can find here: http://www.cdc.gov/flu/swine/index.htm. Source of the spread map of the first 3 days: http://edition.cnn.com/2009/HEALTH/04/26/swine.flu/index.html#cnnSTCOther2
Follow-on spread maps May 3 onward: http://swineflu.ushahidi.com/
Global mobility and high degree of connectivity could facilitate that the outbrake become a pandemic. GIS/GI technology including visualisation e.g. spatial and temporal monitoring of the world air transport is tool for planning measures and quick responses required. Image source: Internet.