MMR Vaccination Guidelines for Adults

Interpretation of Serologic Results

• The Centers for Disease Control and Prevention recommends that a measles IgG level >300.0 indicates robust immunity 1, 2
• A mumps IgG level of 98.6 is considered positive, demonstrating immunity 1, 3
• A rubella IgG level of 22.80 is above the standard positive cutoff value, constituting evidence of immunity 3

Age-Based Immunity Considerations

• Adults born before 1957 are generally presumed immune to measles, mumps, and rubella due to natural infection during childhood, even without documented disease 1, 2, 3
• The American Academy of Family Physicians notes that serologic testing can definitively confirm immunity in adults, regardless of birth year 1, 2

MMR Vaccination Indications for Adults

• The Centers for Disease Control and Prevention indicates that MMR vaccine is only necessary for adults who lack acceptable evidence of immunity, which includes documentation of vaccination, laboratory evidence of immunity, or physician-diagnosed disease 1, 2, 3
• The Advisory Committee on Immunization Practices recommends that adults with laboratory evidence of immunity do not require MMR vaccination 3

Special Considerations

• The Centers for Disease Control and Prevention states that latent tuberculosis infection (LTBI) without active tuberculosis or severe immunosuppression is not a contraindication for MMR vaccination 4, 5
• The American College of Physicians notes that patients with documented serologic immunity should not be revaccinated, as laboratory evidence of immunity is a reliable indicator that vaccination is unnecessary 1, 2, 3