Some interesting patterns that i see based on these are:
b) Most of these virulent strains are resistant to known anti-biotics and drugs and are increasing harder to cure using our current medicines
c) The speed with they spread across the globe is rapidly increasing with each outbreak
Here are some interesting links/articles on this topic:
Age of pandemics - Excellent article by Larry Brilliant in WSJ
Swine flu tracking map by Ushahidi.com
Pls let me know your thoughts and comments on the above!