TABLE 1 Biochemical reactions of different strains of genus Klebsiella ORGANISM

The experience of most workers in clinical bacteriology has been that the organism isolated from certain conditions of the upper respiratory tract and commonly designated as "ozena bacillus " is so similar morphologically and culturally to com-paratively numerous strains of Friedlinder's bacillus that the two organisms are separable with difficulty, if at all. It is, therefore, the opinion of some that not only these organisms but even Klebsiella rhinoscleromatis should be regarded as identical. In connection with studies already published on the occurrence of different types of the Friedlander organisms (Julianelle, 1926) and on the immunological identity of the capsular antigens of all rhinoscleroma strais and Friedlander type C strains (Goslings, 1933; Morris and Julianelle, 1934), it was proposed to study the biological reactions of Klebsiella ozenae with the purpose of an attempted classification. This aim has been accomplished with a certain measure of success, and a report of the classification is made in the present report. EXPERIMENTAL Strains of bacteria studied The bacteria studied in the present investigation included representative strains of types A, B, and C, Friedlander's bacillus, Klebsiella rhinoscleromatis, and 19 strains of Klebsiella ozenae. Of the latter strains, two were isolated in the otolaryngologica