Give him mangoes for breakfast!!! Natural vit C, and really high in it... perhaps keep some colloidal silver or umcka from the healthfood store from down to earth... or give him a glass of juice with a couple of drops of grapefruit seed extract. Durring the three weeks of exposure...
Personally, I would file a complaint, and get any other parents who are against this to do the same thing... Its outragous!
Actually because I am a snot!!! I would probably walk into the principles office stating that your child has a family member that your child is around everyday with a weak immune system. This is irresponsible of not only the school district but the Health Dept. as well, you are outraged at this entire affair, that you are not willing to get a flu shot, because the chance of them being correct on the strain like they were last year is prob. well not worth the chance, and that they are going to be working with him for three weeks outside of school with no account on his record, considering this is the call of the DOE and not yours! So those missing days can not be counted against him.
But I am a B in real life with things like that... so hey.... what else can I say. That would be my source of action, and I wish it would be others as well... I bet they would not introduce it next year if parents who were disturbed by this did the same drastic pull out! What a statement ahhhh!