Abstract
Summary
The present study strengthens the evidence for the role of a hemagglutinin inhibitor in the loss of hemagglutinin by vaccinia virus, and answers a criticism of a previous study. It has also been demonstrated that on serial passage in the Ehrlich ascites tumor loss of hemagglutinin is not limited to the IHD strain of vaccinia virus, but occurs also with the Nelson and Levaditi strains.
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