In the past, egg allergy
was considered a reason not to administer
mumps vaccine; however, recent studies document
that among 1227 known egg-allergic individuals who
received a standard dose of mumps vaccine only two
(0.16%) had any symptoms suggesting anaphylaxis
(37). Other components of MMR vaccine, such as
gelatin (38) and neomycin (39), can produce hypersensitivity
to the vaccine in some individuals.