Eggs - Children are less likely to suffer a severe allergic reaction to milk and eggs as they get older. While the whites of an egg contain the allergenic proteins, patients with an egg allergy must avoid all eggs completely. This is because it is impossible to separate the egg white completely from the yolk. Also, Influenza vaccines usually contain a small amount of egg protein. If you or your child is allergic to eggs, speak to your doctor before receiving a flu shot.