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Rubella immunity. Defining the level of protective antibody
1Munson Medical Center, Traverse City, Michigan.
American Journal of Clinical Pathology
|August 1, 1996
Summary
The National Committee for Clinical Laboratory Standards suggests lowering the rubella immunity threshold to 10 IU/mL. This change reflects evidence that lower antibody levels still provide protection against rubella virus.
Area of Science:
- Clinical Virology
- Immunology
- Public Health
Background:
- The established threshold for defining rubella immunity is 15 IU/mL.
- Recent studies and reports suggest this threshold may be higher than necessary.
Purpose of the Study:
- To evaluate the proposed reduction of the rubella immunity breakpoint from 15 to 10 IU/mL.
- To assess the protective efficacy of lower rubella antibody levels.
Main Methods:
- Review of epidemiologic studies on vaccinated individuals with low antibody levels.
- Analysis of Centers for Disease Control and Prevention (CDC) data and reports.
- Consideration of anecdotal reports regarding rubella reinfection.
Main Results:
- The 10 IU/mL antibody level is protective in the majority of vaccinated individuals.
- While rare, rubella reinfection has occurred in individuals with titers above 15 IU/mL.
- The risk of reinfection at lower titers is considered minimal compared to unvaccinated individuals.
Conclusions:
- Lowering the rubella immunity breakpoint to 10 IU/mL is supported by current evidence.
- Clinical decisions regarding rubella immunity should integrate laboratory results with patient context.
- The effectiveness of rubella vaccination remains high, even with a revised immunity threshold.