POULTRY DISEASES AND THEIR TREATMENT 



Cause. This disease is often clearly a 

 later stage of roup. It is difficult to say 

 where one ends and the other begins. It 

 has been claimed that the organism is the 

 same as that which causes diphtheria in 



FIG. 11. DIPHTHERITIC ROUP 



b, lower beak; /, tongue; m, false membrane. 

 (After Harrison and Streit.) 



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