Q14 ASTHENIA IN FOWLS AND PIGEONS 
lymphadenitis, cultures in ordinary media will give a growth of the 
bacterium of Preisz. With tuberculosis the results would be negative 
(see tuberculosis). Lymphadenoma would be determined by a 
histological examination. 
Prevention. ‘This disease is not communicable directly from in- 
fected to healthy sheep. The virus seems to be wide spread and 
consequently good hygiene is all that can be done in a precautionary 
way. In localities where it is prevalent, the careful disinfection of the 
navel as soon as the cord is severed is indicated. Carré reported good 
results with the use of a vaccine which seemed to cause immunity. 
REFERENCES \ 
1. Exsrrra. Bacillare Nekrose der Leber. Virchow’s Archiv., Bd. C (1885), 
S. 23. 
2. GitrutH. Pseudo-tuberculosis in sheep. (Lymph-adenitis). Jour. Compar. 
Path. and Therap., Vol. XV (1902), p. 324. 
3. GitrutH. Pseudo-tuberculosis in sheep. (Lymph-adenitis). Bulletin No. 1, 
New Zealand Dept. of Agriculture. 
4. No6rcaarp anp Monter. The nature, cause, and economic importance of 
ovine caseous lymph-adenitis. Sixteenth Annual Report, Bureau of Animal Industry, 
1899, p. 638. (Full bibliography). 
5. Preisz anp Gurnarp. Pseudo-tuberculose chez le mouton. Jour. de méd. 
vét. et de zodtech, ser. 3, Vol. XVI (1891), p. 563. 
6. Preisz. Recherches comparatives sur les pseudo-tuberculoses bacillaires et 
une nouvelle espéce de pseudo-tuberculose. Ann. del’ Inst. Pasteur, Vol. VIII (1894), 
p. 231. 
7. Stvorr. Sur une broncho-pneumonie caseouse du mouton, causée par le 
bacille de Nocard-Preisz. Recweil de méd. vét., ser. 8, Vol. VI (1899), p. 657. 
ASTHENIA IN FOWLS AND PIGEONS 
Characterization. This is a disease especially of chickens and 
pigeons in which there is marked emaciation and a failure to take on 
flesh even when fed on the most nourishing food. Because of this, 
the disease has received the popular name of “going light.” 
History. Although this condition or disease has been recognized 
for a long time, it seems to have been first described in 1898 by Daw- 
son. He gives a brief account of the symptoms, morbid anatomy, 
etiology and a somewhat extended description of the specific organism 
which he isolated from the diseased chickens. The writer has studied 
this affection in pigeons but did not succeed in finding the organism 
isolated by Dawson. 
