I have seen this handled in a couple of different ways:
1) First, let me state, for the record, I do not believe in 'mandatory' immunizations - if you feel the same way, you might want to formulate a plan for avoiding it all together.
2) In the event, that for whatever reason, it could not be avoided - I have seen people put lobelia tincture under their tongue during the actual immunization to help neutralize the toxins - then as soon as the needle is withdrawn, they put black ointment on the site to draw out as much of the toxins as possible.
3) I have also seen people go to naturalpathic physicians and get homeopathic immunizations which are taken orally so they have to pass through the body's natural immune system. Then the doctor signs off the immunization - no one need know what type of immunization was done - only that it was taken.
I am still out of the country and apologize for the delay in answering your question, but hope this will be helpful.