BLOOD DISEASES 109 



Symptoms. — Anemic or blanched appearance of 

 the mucous membrane of the head, with a dull 

 appearance and great prostration, usually ending 

 in death in about four days, is characteristic of 

 this disease. In some cases the affected bird may 

 live three to four weeks. Moore reports a decrease 

 in red blood cells and an increase in white blood 

 cells, the latter principally the polymorphonu- 

 lear leukocytes. 



Postmortem Findings. — The liver is enlarged 

 and mottled with grayish patches, due to areas of 

 leukocytic invasion. The germ can be isolated 

 from the internal organs. The kidney shows con- 

 gestion, which may be recognized by^the minute 

 red lines. The intestines may be congest©!^ ^e 

 spleen usually appears normal in size ana color. 

 The red blood cells gradually diminish and a 

 leukocytosis (an increase of the white blood cells) 

 appears. 



Treatment. — Prompt isolation of the well from 

 the sick birds and sanitary measures as given for 

 fowl cholera (see page 83) should be observed. 



Thrombosis 



A bird was sent to the laboratory with the his- 

 tory that it had been sick for several weeks. 

 There was a partial loss of appetite, finally com- 

 plete loss ; the bird showed weakness and a gradual, 

 emaciation. The hen died in about two weeks 

 after coming to the laboratory. 



At autopsy there was noted great emaciation. 

 All organs appeared normal except the circulatory 

 system. There was thrombosis (complete 

 plugging) of the right br&cMal artery (artery to 

 right wing) and the same of the large vessel to 

 the liver, as well as of the iliac and femoral artery 



