When you understand what vaccinations are doing in the immune system I'm convinced there is a link. Purdue recently published the results of a study on vaccinated vs never vaccianted dogs that was enlightening; especially since so many dogs are suffering extreme allergies which vets cover up with Prednisone.
What, saving millions of children's lives?
Would you rather go back to the "good old days" of 30% infant mortality to save us from these pesky allergies?