Management of Non-Immune Adults for Mumps
Adults born during or after 1957 who are non-immune to mumps should receive at least one dose of MMR vaccine, with a second dose strongly recommended for those in high-risk categories including healthcare workers, students in postsecondary institutions, international travelers, and those in outbreak settings. 1
Baseline Vaccination Recommendation
- All adults born in 1957 or later without evidence of mumps immunity require at least 1 dose of MMR vaccine unless they have a medical contraindication or laboratory evidence of immunity 1, 2
- Adults born before 1957 are generally considered immune to mumps, though this presumption has important exceptions 1
- Provider-diagnosed mumps disease is no longer considered acceptable evidence of immunity—only laboratory confirmation of disease or laboratory evidence of immunity qualifies 2, 3
Two-Dose Recommendations (High-Risk Groups)
A second dose of MMR vaccine administered at least 28 days after the first dose is recommended for adults who fall into any of these categories 1, 2:
- Students in postsecondary educational institutions (colleges, universities, vocational schools) 1, 2
- Healthcare workers regardless of birth year if they lack laboratory evidence of immunity 1, 2
- International travelers 1, 2
- Persons living in communities experiencing a mumps outbreak who are in the affected age group 1
Special Considerations for Healthcare Personnel
- Unvaccinated healthcare workers born before 1957 who lack laboratory evidence of mumps immunity should receive 1 dose on a routine basis 1
- During an outbreak, a second dose should be strongly considered for healthcare personnel born before 1957 1
- For healthcare workers born in 1957 or later, 2 doses of MMR are the standard recommendation 2, 4
Evidence of Immunity (Acceptable Criteria)
Adults are considered immune to mumps if they have 2, 3:
- Documentation of 2 doses of MMR vaccine (for high-risk groups) or 1 dose (for general population born after 1957)
- Laboratory evidence of immunity (serologic testing)
- Laboratory confirmation of disease (not provider diagnosis alone)
- Birth before 1957 (except for healthcare workers, who require documentation regardless of birth year) 1
Outbreak Response
During mumps outbreaks, vaccination strategy intensifies 1, 5:
- All persons at risk in the affected age group should receive a second dose if they have only received one dose previously 1
- A third dose of MMR may be recommended by public health authorities for specific groups during outbreaks 5
- Healthcare facilities should strongly consider administering a second dose to previously unvaccinated or single-dose healthcare personnel born before 1957 1
Common Pitfalls to Avoid
- Do not accept provider-diagnosed mumps as evidence of immunity—this was removed from acceptable criteria in 2012 2, 3
- Do not assume birth before 1957 confers immunity in healthcare workers—they require documentation or laboratory evidence regardless of birth year 1, 2
- Do not delay the second dose beyond 28 days minimum interval when indicated for high-risk groups 2
- Do not confuse mumps recommendations with measles recommendations—measles has broader two-dose requirements 1