INFECTIOUS BRONCHO-PNEUMONIA. 355 



When the abscesses are deep-seated, the alarmmg symptoms retam 

 their primary degree of intensity for weeks, until the animals are 

 completely exhausted. Abscesses, originating in deep-seated parts, 

 may even extend towards the surface of the lung, and produce either 

 adhesive pleurisy that can be detected by palpation, or exudative 

 pleurisy, easily recognised on percussion. 



When the infective microbes are not pyogenic the general con- 

 dition appears less grave, the animals exhibit only moderate fever, 

 appetite is diminished but not lost, wasting is slower, and may con- 

 tinue for months, but the affected portions of lung become converted 

 into fibrous masses or a material resembling spleen pulp. 



The duration of infectious broncho - pneumonia, therefore, varies 

 with the nature of the infecting organism. In cases which terminate 

 in gangrene, the animals may survive for three or four weeks ; in 

 those where suppuration occurs, for several months. In short, recovery 

 is the rule in simple broncho-pneumonia ; but from an economic stand- 

 point there is little reason for keeping the animals alive. 



Diagnosis. The diagnosis is not generally very difficult ; for if at first 

 the case may be mistaken for one of simple pneumonia, the persistence 

 or prolonged aggravation of the symptoms and the irregularity in posi- 

 tion of the lesions revealed by percussion and auscultation enable the 

 condition to be distinguished at an early period from simple pneumonia. 



Confusion with acute or chronic pleuro-pneumonia may easily be 

 avoided by noting the absence of pleural effusion, and of the soft 

 pleuritic souffle of peripneumonia, etc. 



Where auscultation is chiefly relied upon it is more difficult to 

 differentiate between this disease and acute tuberculosis, and between 

 it and broncho-pneumonia produced by foreign bodies, although the 

 latter disease develops differently. 



Prognosis. The prognosis is always extremely grave and, in cases 

 where there is gangrene or abscess formation, fatal. From the economic 

 standpoint the chronic form is also very grave. 



Treatment. As broncho-pneumonia is frequently of a secondary 

 character, treatment should at first be particularly directly against the 

 primary condition, whether in the mammary gland, uterus or else- 

 where. Early treatment of suppurative mammitis, metritis, etc., is 

 therefore necessary. 



Broncho-pneumonia is treated by free vesication of the walls of 

 the chest, the administration of tonics and antiseptics, alcohol in small 

 doses, acetate of ammonia in doses of 1 to 2 drachms, salicylate of 

 soda in doses of 5 to 8 drachms per day, salicylic acid in doses of 1 

 drachm, and creosote in doses of 1^ to 5 drachms, given in electuary, etc. 



Diuretics, farinaceous gruels, etc., may be used freely, and are of value. 



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