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A chromium release assay was used to study lymphocyte-mediated cytotoxicity against mumps virus-infected target cells in vitro. Purified lmyphocytes from randomly selected donors killed significantly more virus-infected Vero cells than non-infected cells. Lymphocyte-target cell ratios of 50 to 100:1 and incubation period from 16 to 20 hr were optimal for(More)
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