You might want to consider your own lack of medical wisdom, since when does the flu cause vomiting? Usually it is headaches, fever, sore throat etc, not vomiting. I would think that vomiting is caused by some sort of gastro-intestinal bug. I'm willing to be corrected by someone who knows more about the flu than me, but I've never heard of it causing vomiting.
I think it was a legitimate question. Overtraining is a common occurence with people who are keen on lifting weights and don't want to stop training, and the danger of this occurring is magnified when the body is sick. All the guy was asking was how long would be a reasonable amount of rest before getting back into training. He's trying to take care of himself and you have to criticise him whilst offerring no useful advice whatsoever.
The whole point of these forums is to learn from each other and give advice. Maybe this is the first time he has been seriously ill whilst training? If he wants to ask how long he should wait before resuming what is the harm in that? Especially if he could do more harm by pushing his body too far and make his illness even worse.
For the original poster, I came down with a fever and head cold myself a few weeks ago, nothing too serious, but I rested for a few more days than normal and was fine. I felt that if I did push things it could have made things worse. You won't lose too many gains by resting, your body could be telling you to stop for a little while as well.