lamont
Contributor
didn't we have the bird flu scare a few years back?
Avian influenza has been communicable only from birds to humans and has not mutated to spread from humans-to-humans. There's multiple different mutations that would need to occur to that virus to make it survive in the human throat and make human-to-human transmission possible. This virus already spreads from human-to-human.
When looking at virulence, there's already more cases of this swine flu than avian influenza in the past 7 years, and looks to surpass the numer of cases of SARS very shortly if it hasn't already (already there are more cases of swine flu in nyc than there were cases of SARS in the USA total).
Clearly this is easily more virulent than either SARS or bird flu.
On the Richter scale, if 1918 is a magnitude 9.2, and avian influenza is a 2.0 while SARS is a 3.0, this is at least >= magnitude 4.5 or so and has been climbing up that scale rapidly.