. The pathology and differential diagnosis of infectious diseases of animals. Veterinary medicine -- Diagnosis; Communicable diseases in animals. 78 SWINE PLAGUE usually the ventral lobes are first attacked, then the cephalic and azyffos, and lastly the principal lobes. This movement of the disease seems to depend on gravity, inasmuch as the dis- eased parts are marked off from the healthy portion by a nearly horizontal line. I n other words, the most dependent portions of the lungs are the ones affected first, and as the disease progresses upwards only a small portion of the princi- pal lobe
. The pathology and differential diagnosis of infectious diseases of animals. Veterinary medicine -- Diagnosis; Communicable diseases in animals. 78 SWINE PLAGUE usually the ventral lobes are first attacked, then the cephalic and azyffos, and lastly the principal lobes. This movement of the disease seems to depend on gravity, inasmuch as the dis- eased parts are marked off from the healthy portion by a nearly horizontal line. I n other words, the most dependent portions of the lungs are the ones affected first, and as the disease progresses upwards only a small portion of the princi- pal lobe directly un- der the back of the animal remains per- vious, provided the life of the animal is maintained up to this point. In cases where disease is caused by lung worms or by em- bolism, the pneu- monia involves por- tions of the principal lobes not contiguous to the ventral lobes. Two kinds of pneumonia are encountered, namely, lobar and catarrhal or broncho-pneumonia. In the former the vesi- cular portion of the lung substance is chiefly affected ; in the latter the smaller bronchioles are primarily attacked and the alveoli secondarily. In croupous-pneumonia, there is, follow- ing the stage of congestion, an emigration of red blood cor- puscles, some leucocytes, and an exudate of fibrin into the air spaces. These elements are firmly matted together by the coagulating fibrin, making the diseased lung firm to the touch. In broncho-pneumonia the catarrhal condition of the smaller air tubes makes them impervious to air. The lung tissue which they supply is gradually emptied of air and assumes the appearance of red flesh, owing to the collapse of the walls of. Fig. 10. Portion of a pig's lung showii 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 Moore, Veranus A. (Veranus Alva), 1859-1931. Ithaca
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