186 J)iseases of Poultry 



Burckliardt ^ have found such a condition associated witli 

 the presence of tubercle bacilli in the blood. This was found 

 both in spontaneous and experimental cases of tuberculosis. 



Ellerman and Bang - found this condition in cases wliich 

 were transmissible to other fowls by a filterable virus in- 

 jected intravenously. This disease ran a chronic course. 

 The typical leuksemic condition was reached about three 

 months after the inoculation. 



The only disease of this group which seems to be of any 

 economic importance is infectious leukaemia or fowl typhoid, 

 first described by INIoore.'^ The relation of this disease to 

 human typhoid is discussed on page 111. 



Infectious LeukcBmia or Fowl Typhoid 



This is a bacterial disease often mistaken for fowl cholera 

 but caused by a different species of bacteria and the lesions 

 produced are somewhat different. 



Diagnosis. — The following symptomatology is quoted 

 from IMoore : " From the statement of the owners of the 

 fowls in the different outbreaks and from the appearance of 

 those in which the disease was artificially produced, little 

 can be positively recorded concerning the distinctive or 

 characteristic symptoms. The only fowl examined ante- 

 mortem from the natural outbreaks was first seen only a 

 few hours before death, when it was unable to stand. If 

 held in an upright position, the head hung down. There 

 was a marked ana?mic condition of the mucosa of the head. 



^ Burckhardt, J. L., Ztschr. Immunitdtsf. u. Expt. Ther. Bd. 

 14, pp. 544-604, 1912. 



- Ellerman, V., and Bang, O., Ztschr. Hyg. u. Infeklionskrank. 

 Bd. 63, pp. 231-272, 1909. 



^ Moore, V. A., "Infectious Leukoemia in Fowls — a Bacterial 

 Disease Frequently Mistaken for Cholera." Ann. Rept. Bur. An. 

 Ind., 1895-1896, pp. 185-205. 



