[SauronOfMordor]

SARS has no vaccine, affects healthy people, and has something approaching 3% fatality.

We don't know the true fatality rate. The only way SARS gets reported is if the person gets sick enough to require medical attention. Of THAT subgroup, something like 3-5% will die. The big unknown, currently, is what percentage of those infected get it mild enough that they don't seek medical attention

[cebadams]

What's interesting here is that in a typical flu the morality rate is usually determined by the number of very young or very old who die from the disease. The 4% rate attributed to SARS is not based on these age groups. So the rate may be understated in a large population.