. A text-book of bacteriology, including the etiology and prevention of infective diseases and a short account of yeasts, and moulds, haematazoa, and psorosperms. Bacteriology. INFECTIOUS PLEURO-PNEOMONIA. 239 Filtered cultures are said to confer immunity for six months, and raising the temperature of filtered cultures increases the strength of the substance which gives immunity (Klemperer). The blood serum of immune animals can confer immunity on other animals, and, it is said, will arrest the progress of the disease produced by injection of healthy animals with virulent cultures. The culture
. A text-book of bacteriology, including the etiology and prevention of infective diseases and a short account of yeasts, and moulds, haematazoa, and psorosperms. Bacteriology. INFECTIOUS PLEURO-PNEOMONIA. 239 Filtered cultures are said to confer immunity for six months, and raising the temperature of filtered cultures increases the strength of the substance which gives immunity (Klemperer). The blood serum of immune animals can confer immunity on other animals, and, it is said, will arrest the progress of the disease produced by injection of healthy animals with virulent cultures. The cultures contain a proteid body, for which the name pneumo-toxin has been suggested, and anti-pneumo-toxin has been isolated from immunised blood serum. Pleuro-pxeumonia. Infectious pleuro-pneumonia is a highly infectious disease peculiar to cattle ; it is characterised by rise of temperature and exudation into the lungs. It is often fatal, and sometimes in an extremely chronic form. It is believed to have been unknown in England previously to 1840, and is supposed to have been introduced from Holland, where in one year it destroyed seven thousand Fig. 118.—Acute Cataekhal Pneumonia (Ox). <i, Coagulated mucus with catarrhal cells (c) embedded in it; b, catarrhal cellSiMVC ^'^ sprouting from alveolar walL, ^'^80. (Hamilton.) '" ^^ The disease cannot be conveyed 'artificially. A living, diseased animal must be the medium of infection. The disease is apparently only communicated by cohabitation. Brown injected large quanti- ties of lymph from diseased lungs into the jugular vein, into the. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Crookshank, Edgar M. (Edgar March), 1858-1928. Philadelphia, W. B. Saunders
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