Abstract
Summary
It is shown that the inhibitor present in allantoic fluid for hemagglutination by and absorption of mumps virus is more active when human erythrocytes rather than when chicken red blood cells are used. It appears that the species of erythrocyte present influences the reaction between mumps virus and inhibitor in the direction of more or less combined (non-hemagglutinating) virus. A similar influence, though to a less striking degree, is also shown for the red blood cell in the influenza virus-inhibitor reaction.
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