1) The oncolytic activity of the ED virus against Ehrlich carcinoma cells was destroyed after heat inactivation at 56°C for 30 minutes or irradiation with ultraviolet rays. By this procedure, hemagglutinin and complement fixing antigen of the ED virus remained intact but egg infective activity of the virus was lost completely.
2) Specific antiserum also suppressed the oncolytic activity of the virus after mixed with the virus in vitro for 30 minutes at room temperature. Antiserum injected 30 minutes after virus injection in mice could not suppress the oncolytic activity to the same extent. Active immunization with the virus also inhibited the oncolytic activity of the virus.
3) The complement fixing antigen of the ED virus increased during the process of actual viral oncolysis. We could not recognize any increase in the titre of hemagglutinin nor egg infectivity of the virus throughout the process of viral oncolysis.
4) The yield of CFA in Ehrlich carcinoma cells was much greater than that of the total inoculum and proportional to the amount of seed when the inoculum size was small. When the inoculum size was large enough to presumably involve all the tumor cells, the CFA yield reached its upper limit.
5) Quantitatively, some problems concerning viral oncolysis in individual animal and individual cell have been discussed. The formation of CFA may be an indispensable factor for the phenomenon of viral oncolysis in this system.
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