HEMORRHAGIC SEPTICEMIA 331 



Chronic Form. — ^The lungs show circumscribed, necrotic 

 areas which in some instances are sequestered. -^ In others 

 large areas are hepatized or traversed with small, yellow- 

 colored or gray necrotic foci. In the peribronchial and 

 mesenteric lymph glands caseous centers occur. 



Symptoms. — ^The symptoms so resemble those of hog- 

 cholera that a differentiation in the field is very difficult. 



Peracute Form. — In the peracute form the affected pig 

 shows the symptoms of a general septicemia. The tempera- 

 ture is 108° F. and over. The patient is languid, has no appe- 

 tite, remains apart from the herd and may crawl under a 

 building or straw pile. On parts of the body, especially the 

 ears, neck and sides, red spots appear which cannot be 

 entirely eliminated by pressure. There may be hemorrhage 

 from the nostrils, bowels and urinary organs. In some 

 animals there are symptoms of a severe laryngopharyngitis. 

 The patients usually die in twelve to twenty-four hours after 

 the first symptoms are shown. 



Acute Form. — In the acute form the symptoms are those 

 of an acute pneumonia. The patient shows fever, a short, 

 dry, spasmodic cough, an expiratory dyspnea, breathing with 

 the feet spread apart and mouth open. Palpitation of the 

 thorax causes pain. There is nasal discharge and frequent 

 and violent fits of coughing. The mucous membranes are 

 cyanotic; the eyes show conjunctivitis. Palpitation of the 

 heart is a common symptom. The acute form lasts seven to 

 fourteen days. Complete recovery is rare. Apparently 

 recovered animals frequently harbor the chronic form of the 

 disease. 



Chronic Form. — The chronic form follows the acute. The 

 symptoms are not very pronounced. They consist mainly 

 in periodical fits of coughing, dyspnea, poor appetite, emacia- 

 tion and chronic joint swellings. Finally the patients suffer 

 from diarrhea and death occurs from exhaustion in one to 

 two months. A few cases make apparent recovery but on 

 slaughter sequestered, necrotic foci are found. 



Diagnosis. — ^The differentiation from hog-cholera can only 

 be made bacteriologically. The coexistence of the two dis- 

 eases in the same herd and animal must be born in mind. 



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