Read your question again and then realize you just wondered if it would be possible to engineer a virus to kill all of humanity, with no possible immunity. See

Read your question again and then realize you just wondered if it would be possible to engineer a virus to kill all of humanity, with no possible immunity. See the problem? This is why people hate (software) engineers, they are oh-so-dumb on the "empathizing with humanity" front... pie-in-the-sky ambitions that are more likely to be shitty solutions replacing ones which worked well enough, to blow up, potentially catastrophically, or cause various humanity-ending apocalypses, than to actually solve the problem in most cases...and what do they have to say for themselves? "Oh I didn't think about that". -_-