The interrelationships of the cellular receptors and the hemagglutinin inhibitors of a new strain of virus (1233) to members of the mumps-Newcastle disease-influenza group have been investigated. It was found that strain. 1233 does not destroy the receptors or inhibitors of the other group, nor does the latter destroy 1233 receptors or inhibitor. The sole exception to this statement was a moderate destruction of 1233 inhibitor in egg white by Newcastle disease virus. The classification of strain 1233 was discussed in the light of this evidence, evidence which tends to place strain 1233 in a different category from that of any other strain of the MNI group.

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