Yeah a flu is much deadlier than people think. People die all the time from it. It's just that it we all get it from time to time so we don't realize how dangerous it can be in the right circumstances or to other people. In a world like this, it would be a real threat.
Though I do agree with EE (yikes?) on the fact that the whole spitting up of blood is a little overdone, or would indicate something unusual and a lot worse than a normal flu.
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