A 28-year-old woman with measles IgG 66.40 IU, mumps IgG 90 IU, rubella IgG 0.94 IU, and varicella titer <1:4—does she require any vaccinations?

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Last updated: September 16, 2026 • View editorial policy

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Vaccination Recommendations

This patient needs MMR vaccine for rubella and varicella vaccine (2 doses) immediately. Her rubella titer of 0.94 IU/mL is below the protective threshold of 10 IU/mL, and her varicella titer of <1:4 indicates complete lack of immunity to chickenpox 1.

Specific Vaccine Requirements

MMR Vaccine - Required

  • Rubella component: The rubella IgG of 0.94 IU/mL is non-protective (threshold is ≥10 IU/mL for immunity)
  • Measles component: The measles IgG of 66.40 IU is protective (no additional dose needed for measles alone)
  • Mumps component: The mumps IgG of 90 IU is protective (no additional dose needed for mumps alone)

However, since rubella vaccine is only available as part of MMR, she must receive one dose of MMR vaccine 1, 2. For women of childbearing age, rubella immunity determination is critical due to the risk of congenital rubella syndrome 1, 2.

Varicella Vaccine - Required (2 Doses)

The varicella titer of <1:4 indicates complete seronegativity and lack of immunity 1. She requires:

  • First dose: Immediately
  • Second dose: 4-8 weeks after the first dose 1, 2

All adults without evidence of varicella immunity should receive 2 doses of single-antigen varicella vaccine 1. This is particularly important for women of childbearing age 1.

Critical Precautions

Pregnancy Considerations

Before administering these vaccines, confirm she is not currently pregnant 3. Both MMR and varicella are live-virus vaccines and are contraindicated during pregnancy 3, 4.

  • Ask if she is pregnant or might become pregnant in the next 4 weeks
  • Counsel her to avoid pregnancy for 4 weeks after each vaccination 3, 4
  • Routine pregnancy testing is not required but should be considered 3
  • If she is pregnant, defer all vaccination until immediately postpartum 1, 3, 1

Vaccination Schedule

  1. If not pregnant: Administer MMR and first dose of varicella vaccine on the same day (different injection sites)
  2. Second varicella dose: 4-8 weeks later 1
  3. If pregnant: Administer MMR and first varicella dose immediately postpartum before hospital discharge, with second varicella dose 4-8 weeks later 1, 3, 1

Common Pitfalls to Avoid

  • Do not assume measles and mumps immunity alone is sufficient - she still needs MMR for the rubella component since rubella vaccine is not available separately
  • Do not give only one dose of varicella vaccine - two doses are required for adequate protection 1
  • Do not delay postpartum vaccination if she becomes pregnant - these vaccines should be given before hospital discharge 1, 3, 1
  • Do not skip pregnancy counseling - emphasize the 4-week contraception requirement after each live-virus vaccine dose 3, 4

References

2
Guideline

recommended adult immunization schedule: united states, 2009*.

Annals of Internal Medicine, 2009

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