I would keep my kids out at least the day of the vaxes. I would not take the chance my child might accidentally get the vax.
Since when did schools become medical providers? Did they send home any information on side effects, etc? Do you have to sign for your child to receive the shot? How are they handling informed consent?
At this point we have to send in a statement of interest for either yes or no vax my kids for season flu. We will do the same for H1N1. Then there is another consent form for if you do want with a list of questions about the health of the recipient. You also need to sign that you got the vis (vaccine information sheet) which of course was not actually provided!
I think being around hundreds of recently misted kids is different than an adult in the workplace with several recently misted adults. Say 98% of the kids in the school are misted vs 45% in the workplace. And lets face it, kids are nasty in regards to personal hygiene. They aren't even given the chance to wash hands before lunch. A kid has to step away from the crowd to use the bathroom (maybe get a reprimand for not going when they were supposed to?) and wash before lunch or snack.
Ok -off my rambling soapbox!!!