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Ms Sherry correctly notes that the Rubacell test is not a hemagglutination inhibition procedure. Because this assay for rubella antibody is an easily performed passive hemagglutination test, we have continued to employ it in the identification of rubella-susceptible persons among students in the health professions.We have recently screened the following groups of students for rubella antibody using Rubacell with the following results: nursing students, 22 (14%) of 149 susceptible; optometry students, 12 (13%) of 92 susceptible; and graduate microbiology students, eight (16%) of 50 susceptible. Students with a negative Rubacell test result were immunized during special clinics held at their campuses.
Wakefield M, Alexander WJ. Screening for Rubella Susceptibility-Reply. JAMA. 1982;247(18):2500. doi:10.1001/jama.1982.03320430024022