Some vaccines contain egg protein. The recommendations of the American Academy of Pediatrics (AAP) acknowledge that the MMR vaccine (measles-mumps-rubella) can be safely administered to all patients with egg allergy. These recommendations have been based, in part, on scientific evidence that supports the routine use of one-dose administration of the MMR vaccine to patients with an egg allergy. This includes those patients with a history of severe, generalized anaphylactic reactions to egg.
Influenza vaccines usually contain a small amount of egg protein. According to the American Academy of Allergy, Asthma & Immunology (AAAAI): "Studies show that flu vaccines can be safely administered to egg allergic individuals, wither in the primary care provider's office or allergist's office depending on the severity of the allergic reaction to eating eggs." If you or your child is allergic to eggs, speak to your doctor before receiving a flu shot.