Sixty-two strains of moraxellae and allied bacteria assembled by the Subcommittee on and Allied Bacteria of the International Committee on Systematic Bacteriology and distributed by the American Type Culture Collection were examined serologically by the fluorescent-antibody (FA) and quellung techniques and subjected to study using 71 biochemical tests. These strains, originally assigned to 11 different genera, were placed in two categories: and . There were 41 strains assigned to and 19 to . Two strains were eliminated from the study. One strain belonged to neither of these genera; the other was eliminated on the basis of colonial and biochemical variability. Sixty per cent of the carbohydrate-oxidizing strains of were typable by FA and quellung reaction in conjugates and sera prepared from oxidizing strains. The capsular antigens of the oxidizers (formerly called ) are distinctly different from those of the nonoxidizers (formerly called ). A small percentage of the nonoxidizing cultures exhibited cross-reactions with antibodies for the oxidizers. None of the moraxellae were typable with conjugates or antisera for the oxidizing acinetobacters. The results of these studies were correlated with those of other workers. In general, the classification of the bacteria discussed in this report was quite reliable when based on the use of seven selected phenotypic characteristics. This fact has practical diagnostic importance. The true relationships and taxonomic placements of the moraxellae and allied bacteria are dependent upon the development and employment of systems for genetic analysis. On the basis of studies reviewed in this paper, most workers would now agree upon the separation of the oxidase-positive and oxidase-negative organisms with assignment of the former to the genus Lwoff and of the latter to the genus Brisou and Prévot.


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