Honestly? I stay home and might check email when I'm bored but don't do any real work, but I don't usually file sick days either because the bureaucracy is a pain (seriously, I'm already sick, I can't deal with that added stress and I'm not going to the doctor just to spread my viruses and be told to go back home and rest). And as long as we're talking about 2 or 3 days, nobody really seems to care.
I've always had managers who care more about what I deliver than when and where my butt is in a chair. Maybe I'm lucky, maybe I'm good enough that it works out that way.
