I was told by some other mums in our playgroup that some vaccinations contain a trace amount of peanut oil and could cause an allergic reaction in babies/children. I've tried to look online but not really found any concrete sources. Has anyone every heard of a connection between vaccinations and peanut allergy? Is this just a rumour? I can't imagine why companies would put peanut product in vaccines, seems like that's just asking for trouble.