128 



C'atarrlial Pncuiiioiiia. 



(lato, wliicli is cliscliarg'od from the cut surface. The mucosa is 

 reddened, loosened and swollen. 



In consequence of sei'ous and cellular infiltrations tlie inter- 

 lobular connective tissue apjjears occasionally gelatinous or 

 whitish; this is often the case in cattle, occasionally in hogs, and 

 only exceptionally in other animals. The j^leura frequently ap- 

 pears healthy, occasionally somewhat roughened, at times also 

 covered by a fine fibrinous membrane. The bronchial lymph 

 glands are in a condition of acute swelling. 



Symptoms. Catarrhal pneumonia is usually preceded by 

 the sjanptoms of bronchitis or bronchiolitis; frequently the 

 former manifests itself simultaneously with the latter. In the 

 former case an aggravation of the symptoms points to the ad- 

 vent of catarrhal pneumonia. 



Fig. 17. Fever curve in catarrhal pneumonia of the dog-, terminating in recovery. 



When 1)ronchiolitis is already present, an elevation of the 

 temperature above 40° C. at once creates tlie suspicion that ca- 

 tarrhal pneumonia has developed following the primary dis- 

 ease. This may l)e held with almost absolute certainty if the 

 patient is very young or very old. The fever does not show a 

 typical course; it is of a remittent type and disappears grad- 

 ually after recovery has set in (Figs. 17 and 18). Catarrhal 

 pneumonia of adult animals may, for some time or even u]) to 

 the end, run its course without fever and without other grave 

 general symptoms. 



The respiration is accelerated and made difficult in direct 

 proportion to the extent of the inflannnatory process; dogs, 

 more rarely other animals, blow up their cheeks with every ex- 

 piratory movement (so-called labial breathing). The animals 

 cough from time to time or continually; the cough is usually 



