Sixty-seven elementary school teachers were tested serologically and found to be susceptible to rubella. These sentinel teachers were retested after a large-scale rubella immunization campaign was carried out among the pupils in their schools. None of the 67 teachers developed serological evidence of rubella infection. Thus, there was no evidence of vaccine virus spread.
Fleet WF, Schaffner W, Lefkowitz LB, Murphy GD, Karzon DT. Exposure of Susceptible Teachers to Rubella Vaccinees. Am J Dis Child. 1972;123(1):28–30. doi:10.1001/archpedi.1972.02110070078008
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