174 



POULTRY DISEASES 



One investigator has reported that innnunity against chiek- 

 enpox does not confer immunity to roup. 



Haring and Kofoid have shown that there is a specific antibody 

 developed in birds affected with chickenpox. By the use of the 

 complement-fixation method the blood from the diseased fowl ex- 

 hibited fixation of the complement not shown by normal fowl 

 blood, thus showing that it is a specific germ disease. The antigen 

 was prepared both from the tumors on the head and from the liver 

 of birds sick of the disease. 



Treatment. — The same sanitary regulations should be put 

 into force as under fowl cholera. No birds should be sold 



Fig. 65. Chicken Pox. 

 A, epithelial, tuinor-like nodules; B, an vilcer. 



J'roiu the iiock while the disease exists among them, ("lean- 

 ing of yards and houses and keeping them clean, as well as 

 frequent disinfection, are essential. Antiseptics, as recom- 

 mended under cholera, may be given in the feed and water. 

 The heads of affected birds should be bathed in an antisep- 

 tic solution. The nodules may be touched with lunar caustic 

 and 24 hours later covered with vaselin. 



DIPHTHERIC ROUP 



There is considerable confusion regarding contagious epithe- 

 lioma and diphtheria of fowls, and authorities upon infec- 



