I actually just blogged about this very thing this morning here: http://busybusymomma.blogspot.com/2007/04/this-post-started-out-as-comment-on.html
The DPT contains (exact ingredients can vary by brand:
Formaldehyde, Glutaraldehyde, Latex, 2 - Phenoxyethanol, Pertussis toxin, Pertactin, Aluminum as Aluminum phosphate, Diphtheria toxoid, Tetanus toxoid.
IPV:
Aluminum as Aluminum hydroxide, Formaldehyde, Sucrose, Pertussis toxin, Filamentous hemagglutinin (FHA), Diphtheria toxoid, Tetanus toxoid, Bovine (cow) serum albumin, Sodium hydroxide, Hepatitis B, Medium 199, Haemophilus influenzae B, Acetic acid, Trometamol, Sodium hydrogen carbonate, Potassium dihydrogen phosphate, Disodium phosphate dehydrate.
Here's a list of all vaccine ingredients: http://www.novaccine.com/vaccine-ingredients/
GL... and remember EVERY state in the US has vaccine exemptions, the government cannot force you to vaccinate. It is NOT required to attend school, you simply use an exemption.
If I can help you wade through info, just let me know!