Abstract

Since Hallauer (1) reported the hemaggulutination by the Columbia SK, Columbia MM strain of encephalomyocarditis virus in 1947, the hemagglutination by neurotropic viruses have been widely studied and it has been known that the Mengo encephalomyocarditis virus, encephalomyocarditis virus (2), the Lansing strain of poliomyelitis virus (3), Japanese B encephalitis virus (4) (5), St. Louis encephalitis virus (5), West Nile virus (5), and Russian spring-summer encephalitis virus agglutinate erythrocytes under a certain condition.In 1948 Lahelle and Horsfall (6) discovered that the GD Vll strain of mouse encephalomyelitis virus agglutinated human O group erythrocytes at 4 C, but they did not succeed in the hemagglutination by the FA strain of mouse encephalomyelitis virus. Since then, the hemagglutination by the FA strain has been studied by others but no possitive results have been obtained. We could ascertain in the course of our experiments on the hemagglutination by the FA strain that the specific hemagglutination could be occured when CaCl2 solution as a sourse of reaction medium and domestic f owll red blood cells as that of erythrocytes were employed.

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