Rubella virus grows to a maximum titer of approximately 10-5.0 Int.D.50 in LLC-MK2 cell cultures, with 2:1 input in50 multiplicity. There is always cell-associated virus which accounts for a small portion of the infectious yield. 5-FUDR did not affect in any way the yield of rubella virus as compared to the untreated control. Rubella virus therefore appears to belong to the RNA viruses.
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Maassab et al. (1964) studied this question.