I think its AIDS, not necessarily by how quickly it kills you but that more people die of AIDS related diseases and there’s no cure. Either that or malaria maybe?
In terms of how many people have died from it, I’d probably go for influenza (flu). There are loads of different strains (including bird flu and swine flu). In 1918 a particularly bad outbreak of bird flu killed 50 to 100 million people worldwide in one year!
Remember, AIDS is a set of symptoms (not a virus!) caused by HIV (alright, that is a virus). Malaria isn’t a virus, it’s a parasite spread by mosquitos.
Gemma is right for a class of virus, the flu virus has been the deadliest in human history. And within that the deadliest virus is the Influenza A virus (http://en.wikipedia.org/wiki/Influenza_A_virus). It caused the Spanish flu in 1918, and as Gemma said, killed far too many people. 🙁
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