Very worried about booking my son in for the MMR as my husband has a nut and egg allergy and I've heard there is an increased risk of reaction when allergies such as these exist n the family. Im told the vaccine is no longer grown on eggs, but i can't find much else about it and my doctor didn't seem to know anything. Does anyone have any info? Hes 16 months now so really should get my act together on this. Thanks!