Comments on a Newly Recognized Group of the Meningococcus

Abstract

About 50% of the strains of meningococci which have been superficially “typed” as belonging to Group II have been found to form an independent and homogeneous lot. Those who have worked with individual strains agree that many of them give a definite Quellung reaction, they are good antigens, and produce sera that protect mice well against infections by meningococci of the same group. But there is no cross protection with sera representing other groups.