. The actinomycetes. Actinomycetales. 254 THE ACTINOMYCETES, Vol. I In 1896, Kruse named this organism >S^rep- tothrix israeli. Wright, in 1905, suggested changing the name to Actinomyces bovis, since he considered this organism to be iden- tical with that recorded Harz. It is of interest to quote from Wright: "Branching filamentous micro-organisms have been isolated in pure culture from thirteen cases of actinomycosis in man and two cases in cattle. The micro-organism seems to be all of one spe- cies—grows well only in agar and bouillon cultures and in the incubator; in the other
. The actinomycetes. Actinomycetales. 254 THE ACTINOMYCETES, Vol. I In 1896, Kruse named this organism >S^rep- tothrix israeli. Wright, in 1905, suggested changing the name to Actinomyces bovis, since he considered this organism to be iden- tical with that recorded Harz. It is of interest to quote from Wright: "Branching filamentous micro-organisms have been isolated in pure culture from thirteen cases of actinomycosis in man and two cases in cattle. The micro-organism seems to be all of one spe- cies—grows well only in agar and bouillon cultures and in the incubator; in the other usual culture media and at room temperature, it grows onlj' very little or not at all. It is essentially an an- aerobe. It does not form spore-like reproductive ; Wright added: "In cultures its colonies are similar in char- acter to colonies of the microorganism in the lesions of actinomycosis. If colonies of the micro- organism are immersed in animal fluids, such as blood serum and serous pleuritic fluid, the fila- ments of the colonies in immediate contact with the fluid may, under certain unknown conditions, become invested with a layer of hyaline eosin- staining material of varying thickness, and the filament may then disappear. Thus structures are produced that seem to be identical with the char- acteristic 'clubs' of actinomyces colonies in the ;. Figure 99. N. asteroides in sputum (Repro- duced from: Kirby, W. M. M. and McXaught, J. B. Arch. Internal Med. 78: 8, 19-16). Wright emphasized further: "Between Actinomyces from the hvmian and bovine cases I have found no difference which seems to me to be sufficient to justify their classi- fication as separate species. "I do not accept the prevalent belief, based on the work of Bostroem, Gasperini, and others, that the specific infectious agent of actinomycosis is to be found among certain branching microorgan- isms, widely disseminated in the outer world, which differ profoundly fr
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