In a series of investigations on the epidemic spread of bacterial infection among mice (Topley, 1919, 1921), it has repeatedly been noted that, if an epidemic be started among a mouse-population by feeding certain animals on cultures ofB. gaertnerand subsequently introducing other susceptible mice into the cage, a varying proportion of these latter may succumb to infection with an organism morphologically and culturally identical withB. gaertner, but differing sharply from it in regard to its agglutination reactions. This organism has been referred to in previous communications as belonging to theB. suipestifergroup, using that term to includeB. aertryckeand other closely related types.
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