228 Veterinary Medicine. 



Some congestion and swelling of the bronchial glands may also 

 be noted. 



In capillary bronchitis the larger capillary tubes, of a milli- 

 metre and over, show a tumid, congested mucosa, and submucosa 

 with a considerable collection of muco-purulent matter. In the 

 smaller bronchia, less than a millimetre in diameter, there is a 

 similar congestion and swelling but the tubes are usually filled, 

 and even abnormally distended with the muco-purulent product 

 containing an excess of small, round, granular exudation cor- 

 puscles, which also fill the submucosa. In the minute terminal 

 tubes opening into the air sacs and air cells, the air passages are 

 filled with the same inflammatory exudate which extends into 

 the alveoli as well, constituting dirty white or yellowish centres 

 in the midst of a general red consolidated lung tissue into which 

 the inflammation has extended. In short, the case has merged 

 into broncho-pneumonia. Other lesions in such lungs are col- 

 lapse, from the blocking of individual bronchia by inspissated 

 mucus, emphysema, lobular and interlobular, determined largely 

 by the spasmodic coughing and the frequent sudden over-disten- 

 sions of the already paretic air sacs and alveoli. It may also be 

 charged in part on the hurried and forcible inspirations, which 

 are the efforts to introduce a sufficiency of air into lungs which 

 are in many parts, obstructed, blocked and collapsed, so that the 

 still pervious portions are necessarily over-distended under the 

 violent efforts. Combined with the other elements of the abun- 

 dant exudate into and around the capillary bronchia and alveoli, 

 are numerous microorganisms which may vary in different cases 

 and outbreaks and represent the progeny of the original sapro- 

 phytes which have become pathogenic under the existing en- 

 vironment. 



Prevention. To obviate outbreaks of infectious bronchitis, pre- 

 cautions must be taken against infection from outside in shows 

 and other public gatherings of dogs, in travelling by rail or boat, 

 in sending into other kennels or packs for service or other 

 purposes, or in being placed in public buildings in which in- 

 fected dogs may have been kept. When the animal which has 

 been thus sent from home is returned to its home and companions 

 he should be first placed alone in quarantine for two weeks, and 

 bathed with an antiseptic lotion before he can be considered safe. 



