In any case, it's probable that in those instances, a component other than egg was responsible. If there are any concerns, the vaccination should be given to the child as an outpatient in a paediatric department with full resuscitation equipment available. Normally a test dose is given before the full dose. As with egg allergy, allergic reactions to cow's milk are usually mild but a few people do experience extreme reactions. Remember that recipes change occasionally.
Some supermarkets produce lists of their own-brand products free from milk.
Many people find these invaluable. Some people assume that vegetarian cheese is milk-free. This is not the case. Milk products can turn up in unexpected places. A child had a mild reaction when he ate food from a plate washed in Ecover washing-up liquid.