This could be the one, we haven't had a major flu pandemic in almost a hundred years.
In 1918 the spanish flu killed 50-100million people roughly 3% of the worlds population.
Quoting: Anonymous Coward 9816158 It only had a 20% fatality rate but was highly contageous so 1/3 of people caught it.
This with 60% fatality and also being highly contageous could potentially kill 10% of the population.
Unfortunately, I think your estimation of 10% population death toll might be massively under estimated.
Depending on just how contagous this bug ends up being when it mutates to airbourne vectoring, and taking into account that it will probably travel around the world in "waves", increasing the risk of exposure to a higher degree of the population.
Then add to that, unlike the 1916 Spanish Flu, that killed overnight, this monster has already been known to have its host linger for over ten days so far, again promoting a greater threat of contamination and of spreading itself.
Not to mention, from what I have read, it is a slow and very painful death.
10%, no I think more like a minimum of 30% and even then Im sceptical of underestimating its capacity, there are just too many "variables" working in its favor for it be terrifyingly devestating.
The very thought of it terrifies me.
