PSEUDOLEUKEMIA— HODGKIN'S DISEASE 327 



and the fact that a number of fowls may be affected at the 

 same time, assist in arriving at the diagnosis. 



Prognosis.— Very unfavorable. Recoveries are very rare. 



Treatment.— No treatment has proved of any value. Dis- 

 infection of the premises and destruction of all affected birds 

 are advisable. 



PSEUDOLEUKEMIA. HODGKIN'S DISEASE. 



Definition.— A disease characterized by a progressive 

 enlargement of the blood-forming organs (spleen, liver, 

 lymphatic glands) and nodular growths in these and other 

 organs. It resembles leukemia in many respects. A 

 notable exception is that the white corpuscles are not 

 increased as in leukemia. 



Occurrence.— The disease appears most commonly in dogs, 

 cats and chickens. It is more common, however, in dogs and 

 chickens than leukemia. 



Etiology.— The true character of the disease is not known. 

 The etiological factors are believed by some authorities to be 

 identical with leukemia. Others are not in accord with this 

 belief. 



Pathology.— The lesions found in pseudoleukemia resemble 

 very much those found in true leukemia. Enlargement of 

 the spleen, liver and lymph glands is observed in most cases. 



Symptoms. — Progressive anemia and enlargement of the 

 lymph glands are the prominent early symptoms. Examina- 

 tion of the blood will show that the ratio between the red 

 and white corpuscles is nearly normal. Other symptoms are 

 practically the same as in leukemia. 



Diagnosis.— A diagnosis can be made only by a micro- 

 scopic examination of the blood. It should be differentiated 

 from leukemia, malignant tumors and tuberculosis. 



Prognosis. —Unfavorable. 



Treatment. —Treatment is unsatisfactory. Iron and quinin 

 citrate (0.2 to 0.4 twice daily), or Fowler's solution of arsenic 

 (0.2 to 0.6 once daily) may be tried. Potassium iodid in 

 small doses is also recommended. 



