Volume 84, Issue 4 e13294
ORIGINAL ARTICLE

Faster waning of the rubella-specific immune response in young pregnant women immunized with MMR at 15 months

Wan-Ju Kung

Wan-Ju Kung

Department of Laboratory Medicine, Fooyin University Hospital, Pingtung, Taiwan

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Ching-Tang Shih

Ching-Tang Shih

Department of Family Medicine, Fooyin University Hospital, Pingtung, Taiwan

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Yung-Luen Shih

Yung-Luen Shih

Department of Pathology & Laboratory Medicine, Shin Kong Wu Ho-Su Memorial Hospital, Taipei, Taiwan

School of Medical Laboratory Science and Biotechnology, Taipei Medical University, Taipei, Taiwan

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Ling-Yao Liu

Ling-Yao Liu

Department of Laboratory Medicine, Mennonite Christian Hospital, Hualien, Taiwan

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Chiou-Huey Wang

Chiou-Huey Wang

Alere Health Corp., Taipei, Taiwan

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Ya-Wen Cheng

Ya-Wen Cheng

Department of Clinical Pathology, E-Da Hospital, Kaohsiung, Taiwan

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Hsueh-Chiao Liu

Hsueh-Chiao Liu

Department of Laboratory Medicine, Fooyin University Hospital, Pingtung, Taiwan

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Ching-Chiang Lin

Corresponding Author

Ching-Chiang Lin

Department of Education and Research, Fooyin University Hospital, Pingtung, Taiwan

Department of Medical Laboratory Sciences and Biotechnology, Fooyin University, Kaohsiung, Taiwan

Correspondence

Ching-Chiang Lin, Department of Medical Laboratory Science and Biotechnology, Fooyin University, 151 Jinxue Rd., Daliao Dist., Kaohsiung 83102, Taiwan.

Email: [email protected]

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First published: 22 June 2020
Citations: 6

Funding information

The study was funded by Fooyin University Hospital (Grant No: FH-HR-108-09).

Abstract

Problem

Vaccination is the best protection against rubella and congenital rubella infection. Although a high rate of immunization coverage is achieved in Taiwan, it is unknown if the vaccine-induced immunity persists from the age of vaccination to childbearing age.

Methods of study

A total of 5,988 prenatal rubella IgG test results of young pregnant women aged 19-23 years old from six hospitals during January 2001 to December 2008 and January 2013 to December 2017 were analyzed. We compared the rubella seropositivity rates and titers in these women who were vaccinated with MMR vaccine in four different vaccination age cohorts.

Results

The overall rubella seropositivity rate was 87.4% (95% CI: 86.6%-88.3%), and the mean rubella IgG level was 39 IU/mL among young pregnant women aged 19-23 years. Women in the elementary cohort had the highest rubella positivity of 90.8% (95% CI: 89.6%-91.9%), and levels gradually decrease to 84.6% (95% CI: 82.4%-86.7%) in 15-month plus cohort. The average rubella IgG was only 25 IU/mL for the 15-month plus cohort. Women in cohorts immunized at younger age exhibited significantly lower chances of being seropositive relative to women in older cohort after adjusting other factors (all P < .01).

Conclusion

The rubella seropositivity rate and rubella IgG levels were low among young women aged 19-23 years, especially in cohorts immunized at younger age. As rubella immunity wanes over time, a third dose of MMR may be a protective strategy for women who conceive later in life.

CONFLICT OF INTEREST

None to declare.

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