. A text-book of bacteriology; a practical treatise for students and practitioners of medicine. Bacteriology. 626 PATHOGENIC MICROORGANISMS calcification of the necrotic masses, leading to spontaneous cure. As a rule, this process is extremely chronic. Infection in the lungs or in the intra-abdominal organs is, of course, far more serious. When death occurs acutely, it is often due to secondary infection. The disease is acquired probably by the agency of hay, straw, and grain. Berestnew ' has succeeded in isolating actinomyces from straw and hay which he covered with sterile water in a potato
. A text-book of bacteriology; a practical treatise for students and practitioners of medicine. Bacteriology. 626 PATHOGENIC MICROORGANISMS calcification of the necrotic masses, leading to spontaneous cure. As a rule, this process is extremely chronic. Infection in the lungs or in the intra-abdominal organs is, of course, far more serious. When death occurs acutely, it is often due to secondary infection. The disease is acquired probably by the agency of hay, straw, and grain. Berestnew ' has succeeded in isolating actinomyces from straw and hay which he covered with sterile water in a potato jar and placed in the incubator. After a few days small white specks looking like chalk powder appeared upon the stalks, which, upon further cultivation, he was able to identify as the organism in question. Animal inoculation, carried out extensively both with pus and with pure cultures by several observers, has yielded little result. Progressive. Fig. 143.—^Branching Filaments of Actinomyces. (After Wright and Brown.) actinomycotic lesions were never obtained, although occasionally small knobs containing colonies surrounded by epithelioid cells and connective tissue were observed, showing that the invading microorganisms were able to survive and grow for a short time, but were not sufficiently virulent to give rise to an extensive disease process. Transmission from animal to animal, or from animal to man directly, has not been satis- factorily proven. Whether or not there are various forms of actinomyces must as yet be regarded as an open question. The investigations of Wolff and Israel, however, together with those of Wright, who alone observed thirteen different strains, seem to indicate that most, if not all, of the cases clinically observed are due to one and the same microorganism. 1 Berestnew, Ref. Cent. f. Bakt., 24, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appear
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