INFECTIOUS DISEASES. 515 



valesceiioe; or, in an iinfoitunately Uiv^e iiiiniber of cases, the course 

 of tlie disease is coniplicaUHl l)y local inllaininatorv trouhles, whoso 

 gravity is greater in inlhuMiza than it is when they occur as sporadic 

 diseases. 



(^<>m.j>l!cafio/us-. — The complications are congestions, followed by 

 inflaniniatory phenomena in the various organs of the body, but they 

 are most commonly located in the intestines, lungs, brain, or vascular 

 lamina* of the feet. Atmospheric influence or other surrounding 

 influences of miknown (juality seem to be an important factor in the 

 determination of the local lesions. At certain seasons of the year, 

 and in certain epizootics, we find 40 and 50 per cent or even a greater 

 I)ercentage of the cases lendered more serious by complication of the 

 intestines; at other seasons of the year, or in other epizootics, we find 

 the same percentage of cases complicated by infianmiation of the 

 lungs, while at the same time a small j^eicentage of them are com- 

 plicated by troubles of the other organs; inilammatory changes of 

 the brain, of the lamina', more rarely commence in epizootic form, 

 but are to be found in a certain small percentage of cases in all 

 epizootics. 



Exciting causes are important factors in complicating individual 

 cases of influenza, or in localizing special lesions, during either enzo- 

 otics or epizootics. These exciting or determining causes act much 

 as they would in sporadic inflammatory diseases, but in this case we 

 find the animal much more susceptible and predisposed to be acted 

 upon than ordinaiy healthy animals. With a temj)erature already 

 elevated, with the heart's action driving the blood in increased 

 quantity into the distended bl(X)d vessels, which become dilated and 

 lose their contractility, with a congesticm of all the vastailar organs 

 already established, it takes but little additional irritation to carry 

 the congestion one step further and produce inflammation. 



Conipliratioii of th' hitcsthiifi. — When any cause acts as an irri- 

 tant to the intestinal tract during the course of this specific fever it 

 may produce inflammation of the organs belonging to it. This cause 

 may be constipation, wjiieh can lintl lelief onl\ in a congestion which 

 offei-s to increase the function of the glands and relieve the inertia 

 caused by a tem]>orary cessation of activity; oi- iiritant medicines, 

 especially any increa.sed use of antimony, turi>entine. or the more 

 active remedies; the talking f)f indige.stible feed, or of feed in too 

 great (|Uaiitities. or that has been altered in any way by fungus or 

 other injui ious alterations; the swallowing of too cold water: or any 

 other irritant may cause congestion. This complication is u.shered 

 in l)y colics. The animal |)aw> with the fore feet and evinces a gieat 

 sensibility of the belly; it looks with the head from si<le to side, and 

 may lie down and get up, not with violence, but with care for itself, 

 I>erfectly protecting the surface of the belly from any violence. At 



