While I truly sympathize with your situation, I'm going to be the voice of dissent. Please do not send a sick child to school. I realize you have something of a "special case", but you simply do not know the situation of the other children in the class. My daughter just started K a week and a half ago, and has just come down with Scarlet Fever (granted I don't know whether someone in her class infected her, or if she picked it up somewhere else, but school is the only place where she is in close contact with other children). We are uninsured, had to go to the emergency room for treatment, and are now facing hundreds of dollars of medical bills which we can't afford to pay. In other possible scenarios, a child in school might have a compromised immune system and exposure to something that might be a simple virus for other kids, could cause serious damage to them and send them to the hospital. You just never know who you might infect and what the consequences will be for that person. And while the possibility of getting sick is a part of every normal life, knowingly sending a sick (and likely contagious) child to school just ain't right in my book.
Now, if you are CERTAIN that he is no longer contagious, then that's a different story. Then it just depends on his own comfort level. But if you think there is a chance that he is still contagious, no way.
PhDin' mama to dd (Oct. 2005)