To think that if you're a guest in someone's house and you become ill (with a cold or flu - generally a virus), you should go home? Am I being harsh? I think it's inconsiderate to take yourself to someone's house if you know you're ill, or to stay at their house once you come down with something (especially if small children live there). I find this behaviour very selfish - spreading your germs and potentially infecting the actual residents of the house.