INFECTIOUS TRACHITIS 



39 



Hie disease in tiie flock at I.everett. Tlie fact tliat these seven birds were 

 brought to the I-aboratory of Veterinary Science at Amherst and given 

 the best of individual care made little difference in .mortality, as com- 

 pared with the flock as a wiiole. Wiien an atteini)t was made to trans- 

 mit the disease to pullets of the same age from anotlier source, only one 



Table 9. — The first transfer of virus from chronic field cases. 



* VR 1, VR 2, and VR 3 were inoculated with exudate from the trachea of one of the Water- 

 town fowls; VR 4 and VR 5 were placed in a cage with another Watertown bird and kept for a 

 month, until the fowls had completely recovered from the disease; V 2213 and V 2214 were fed the 

 trachea, lungs, spleen, liver, and kidneys of a third fowl showing lesi.ms of infectious trachitis. 



