Abstract
Childbearing-aged women (450) were screened for rubella hemagglutination inhibition (Hl) antibody after a clinical history of susceptibility was obtained; 149 (33%) were susceptible (titers < 1:8), pointing out the need for a more active immunization program for susceptible young women and for routine vaccination of children. Clinical history correlated poorly with the level of Hl antibody. All the patients were vaccinated and protective antibody titers developed in 97%. Since titers are higher after infection than after vaccination, periodic reevaluation of the vaccinated group may be indicated if immunity is to be ensured.

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