I think it's less a problem of how quickly it kills people rather than how strong are the symptoms. And the strength of the symptoms I would assume is very corr

I think it's less a problem of how quickly it kills people rather than how strong are the symptoms. And the strength of the symptoms I would assume is very correlated to its deadliness. What makes this virus travel very far is precisely the fact that it is not very deadly and that half the carriers don't even realise they had it.