Swine flu distinguished from Bird, Zombie varieties

(Sighted elsewhere, but this seems to be the source. Click to enlarge.)

Update 9/2/09 -- Links followed from Sitemeter traffic today suggest a different origin for this chart, that it may possibly have originated with Mark H. Harris at a site called Off the Charts. I don't want to get involved in any mishegaas about who created this work so I report the additional information. Who would have thought that a chart about the flu would go viral so quickly?

(Sorry. I couldn't resist that one.)