would the latter even be safe/advisable, i wonder
ds1 is 4.5yo and had the first course of singles and has had boosters for measles and rublla
ds2 is 2.5yo and has the first jabs of each of measles and rubella
not sure what to do tbh. it seems that (because the mumps vaccine is now unavailable in the UK) i either give them the MMR in addition to what they've already had (?) or leave them unprotected against mumps
opinions/experiences?