Thank you for your inquiry.
As you know, measles and mumps vaccines are prepared in chicken embryonic fibroblast culture, but contain negligible or no egg protein. Thus, several studies have shown that MMR is safe to administer in children with egg allergy. In fact, it has been suggested that children with egg allergy do not need skin testing with MMR vaccine. Nonetheless, I can understand your concern, and certainly, since a graded challenge with MMR is not a difficult procedure and can be done easily in the office, there is no harm in taking extra caution and administering the vaccine using such a graded administration protocol as is noted in Table 5 and Figure 1 of the reference below.
In summary, although there is no scientific evidence that this child is at risk of having an allergic reaction to MMR vaccine, in view of the circumstances, it would be prudent, if you have concern, to proceed with a graded challenge dose rather than administer the entire amount with one injection.
Thank you again for your inquiry and we hope this response is helpful to you.
Kelso J, et al. Adverse reactions to vaccines: Practice Parameter 2012 Update. J Allergy Clin Immnol 2012; 130(1):25-43.
Phil Lieberman, M.D.