INFECTIOUS DISEASES. 5'25 



a quantity of fluid blood fioiu n luMuonhaofe. Avhioli i)roves fatal. 

 The dischar^'^e is fetid to tlie sini'll. The animal oniariates rapidly. 

 On examination of the lun<is mucous rfdes are heard in the lar«rer 

 bronchi, cavities may be found at any i)art of these orjrans. and 

 points of lobular )»ni'um<niia may l>e (k'tecteth 



A very serious comi)lication is an inMauimation of the iieait muscle. 

 This is shown by a very weak muI rapid pulse. <rreat prostration, 

 some fillin<r of the Innjrs. This comi)lication lu^ai'ly always termi- 

 nates in death. Other complications which may be jnentioned are 

 inflamnuition of the kidneys, blood poisoning, congestion of the brain, 

 and inflamnuition of the tendinous sheaths and the tendfms of the 

 legs. 



Dlagnosh. — As fever is the first symptom of infectious pneumonia, 

 it is useful duiing an outbi-eak of this disease to make daily tem])er- 

 ature measurements of the exposed horses, so that the tirst indication 

 of disease may be discovered and the horse removed from contact 

 with those that are sound. 



I'rogiiosls. — The mortality in this disease nuiy be as high as '2.") 

 per cent, but it is usually not more than 10 per cent. If there is 

 a special tendency to complications of some sort, tlie mortality is 

 increased. 



Alterations. — At the time of death from infectious jineumoiiia we 

 fieqiu'ntly find septic changes and the evidences of })iitrefaction. The 

 solidification of the lung tissue is found irregular in shape and high 

 around the root of the lungs and the large bronchi, and is generally 

 covered by sound lung tissue. The anterior lobes of the lungs are 

 usually entirely a fleeted. The diseased portion appears of a gray- 

 yellowish color, somewhat watery, and tears readily. Matter is found 

 in the air tubes which form guttei-s through the jellylike mass of the 

 diseased lung. Abscesses from the size of a nut to larger masses may 

 be found throughout the lungs. The blood is dark in color, fluid, or 

 only clotted into soft, jelly like masses. Masses of gangrenous or 

 dead-black tissue may be present. 



Treatment. — Bleeding is not to be used, because it would only still 

 further weaken an already enfeebled animal: antimony or the alter- 

 ants would inci-ease the depression of a too-dei)raved constitution. 

 There is in this disease no acute congestion of a particular organ to 

 draw off by dejjletive measures, nor any violent blood current to be 

 retarded, for fear of hyperniitrition of any special part. 



Revulsives do good, as they excite the nervous system and awiiken 

 the tori)or of the weakened blood vessels, which aid in the reestab- 

 lishment of the functions. As in other diseases, mustard poultices 

 may be applied over the Indly and sides of the chest, but caution must 

 be used in the employment of blisters, as ugly ulcers may result from 

 their action on a tissue of weakened vitalitv. Setons are dangerous 



