DISEASES AND PESTS OF FOWLS 
in a comparatively short time. The form 
of the disease, in which yellowish patches 
develop on the throat, is dealt with under 
diphtheria or diphtheritic roup. 
Cause. Cases of roup occur when birds 
are subjected to draft and damp, but the 
cause must be infection with disease germs. 
It is believed that the almost constant pres- 
ence of the germs is due to lack of regular 
disinfection and to birds in the flock be- 
lieved to have recovered from a previous 
attack of the disease, but that, in reality, are 
suffering from chronic roup, and are able, 
whenever suitable conditions arise for an 
outbreak of this disease, to infect the rest of 
the flock through the drinking water and 
the soil. 
Treatment. ‘The seriousness of this dis- 
ease makes it tmperative for the poultry 
rearer to isolate immediately any birds 
showing any suspicious symptoms. If 
treatment of the infected bird is taken in 
hand early, and carried out faithfully, a 
cure can be effected, but it is often wiser to 
kill and burn infected stock. In treating 
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