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Conclusion and SummaryThe findings just summarized support the presumption that this group of agents is composed of representatives of the viral species responsible for measles.Eight agents exhibiting the properties of viruses have been isolated in cultures of human or simian renal cells from the blood or throat washings of five cases of typical measles. Multiplication of the agents in vitro is accompanied by characteristic changes in the cells. Primarily these changes consist in the formation of syncytial giant cells wherein the chromatin assumes a marginal position and is replaced centrally by an acidophilic substance of unknown nature. The cytopathogenic effect of at least one of the agents is inhibited by convalescent phase measles sera from other patients with measles. Antigen appears during cultivation in vitro of the measles agents that reacts specifically in complement fixation tests with convalescent phase measles sera.
Enders et al. (Tue,) studied this question.