]]'hitc Diarrhea 



289 



of cases the hen is the source of the infection. It has been 

 fairly •well proven that female chickens recovering from 

 white diarrhea become bacillus carriers. In such birds 

 these bacteria are found particularly in the ovary. In this 



Fig. 60. 



■ The normal ovary of a laying hen. 

 and Jones.) 



(After Rettger, Kirkpatrick 



organ they cause many of the de%'eloping ova to become 

 abnormal and undergo degeneration as shown in Fig. 61. 

 Many of the yolks which do not degenerate contain these 

 bacteria. These infect the chick which hatches from such 

 an egg. These chicks then serve to infect others in the 

 incubator or in the brooder. This is undoubtedly one of 



