8 MASS. EXPERIMENT STATION BULLETIN No. 284 



and po.ssihly from the inoulli, nostrils, and eyes. The organsim has been isolated 

 from an abscess in the foot, which at one time appeared to have communicated 

 with the exterior. The organism has also been found in the respiratory system. 

 According to investigations, the presence of th(> organism has l)een observed in 

 eggs and droppings. 



10.— Through what avenues may birds become infected? Birds have 

 been infected by way of the digestive and respiratory tracts, eyes, abrasions in 

 the skin, and cloaca. 



I 



Photograph 7. — Testicles Removed from a Reacting Adult Male. 

 Testicle No. I appeared to be functioning even though its structure was firm and its 

 size greatly reduced. .S. pullorum was isolated from this testicle. Testicle No. II ap- 

 peared to be normal In size and texture. S. pullorum was not isolated from this organ. 

 Refer to question 7. 



11. — How may infection be introduced into an adult flock? The 



disease may be introduced into an adult flock through buying infected stock, 

 returning birds from .shows or contests, using equii)ment (bird and egg crates, 

 feed sacks, etc.) that may have been contaminated elsewhere; feeding infective 

 eggs; and feeding garbage which miglit contain infective eggs or offal of infected 

 birds. 



