HEMORRHAGIC SEPTICEMIA 327 



In the acute form the subcutaneous connective tissue of the 

 dewlap, neck, and throat shows gelatinous infiltration. The 

 mucous membranes of the head, air passages, abomasum, 

 and bowel are inflamed (reddened and swollen). The lymph 

 glands are enlarged, difl'usely reddened (bloodshot). Pete- 

 chiae and ecchymoses are noted in the serous membranes, 

 kidneys, and lymph glands. In many cases, even in the acute 

 form, the lungs are involved. In them are found dark, red- 

 dish-brown areas of bronchopneumonia surrounded by infil- 

 trated interlobular connective tissue. The spleen is usually 

 normal. 



In the subacute form bronchopneumonia involving the 

 anterior and lower parts of the lung is present. The pleura 

 and also the pericardium are often covered with fibrinous 

 pseudomembranes and the serous cavities partially filled with 

 a clear, yellow or turbid fluid. Bronchitis and enteritis may 

 also be present and in many cases fibrinous rhinitis. 



In the chronic form larger areas of the lung and pleura are 

 involved. Thickenings and adhesions are common. The in- 

 volved area is hepatized, some areas which have undergone 

 necrosis are surrounded by connective tissue capsules. The 

 necrotic foci, when cut through, show a yellow center of viscid 

 pus surrounded by concentric layers resembling in structure 

 an onion. However, in some cases none of the internal organs 

 show marked pathological changes. There are in such only 

 the symptoms of a severe pneumonia and cachexia. 



Symptoms. — ^In the acute form, which usually lasts two to 

 five days, or even a shorter period, there are symptoms of a 

 severe feverish disease. The lambs are very dull, stupid, 

 refuse to eat, show iiicreased thirst, dyspnea, colic symptoms, 

 and twitchings of the muscles. The temperature is often 

 105.8° F. 



In subacute cases the animal may live one to three weeks, 

 during which time it shows symptoms of fever, poor appetite, 

 and languor, with mucopmulent discharge from the eyes and 

 nose. In some instances there are s^Tnptoms of pleuropneu- 

 monia; in others enteritis with a discharge of a yellowish- 

 green, later darker colored, fetid feces. In some cases nodules 

 and also ulcers are noted on the mucous membrane of the 



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