Merck Co. who manufactures the MMR stopped making the individual doses some time ago.  They used to make them separately.  However, check with the company online directly to see if manufacture of individual antigens will resume.  For children, the MMR combination has proven successful and reduces the number of injections a child would receive.  Delaying immunization for any reason other than medical has no scientific support and can endanger other children who are not immune. Ask y our pediatrician or medical home about your concerns.
 
Wayne Yankus, MD, FAAP
expert panelist: pediatrics