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RE: One MR Vaccine Prevent Two Diseases
That is, if the child has previously received immunization MMR (Mumps, Measles, Rubella), still must get the MR vaccine.
MR is given again in lieu of a second administration of MMR, because MR is cheaper and protection against Measles and Rubella are very important.
Its not given in addition to, it's actually replacing a second administration of MMR.
In countries where two doses of MMR are given, then NO MR vaccine is administered as it is redundant.
MR vaccine is given to prevent occurrence of disease caused by virus measles and rubella (German measles). While MMR, is a vaccine to prevent occurrence of infectious diseases measles, mumps and rubella.
So, even if the child has previously received the MMR vaccine, the child should get the MR vaccine. it is safe, there is no double dose.