This article is from the Childhood Vaccinations FAQ, by Lynn Gazis-Sax lynng@alsirat.com with numerous contributions by others.
The Merck Manual describes it as "sustained." (See also Q3c.4 for the
PDR's description of the duration of all the MMR-induced antibodies.)
Another reference, from Heather Madrone:
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D. M. Horstmann "Controlling Rubella: Problems and Perspectives"
_Annals of Internal Medicine_, vol. 83, no. 3, pg. 412
Horstmann found reduced antibody formation 3-5 years after
administering the vaccine and 25% of those tested showed no immunity
to rubella at all.
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