Archive image from page 513 of The pathology and differential diagnosis The pathology and differential diagnosis of infectious diseases of animals differentpathology00moorrich Year: 1908 488 DIPHTHERIA IN FOWLS symptoms of it. There is a general belief that the disease ma}- be developed by exposure of birds to draughts of air or b} keeping them in damp, filthy and badly-ventilated houses. It is presumable that this belief in its etiology is not well founded because of confusion existing concerning the early symptoms of acute diphtheria and those of all stages of the chronic form, and those o
Archive image from page 513 of The pathology and differential diagnosis The pathology and differential diagnosis of infectious diseases of animals differentpathology00moorrich Year: 1908 488 DIPHTHERIA IN FOWLS symptoms of it. There is a general belief that the disease ma}- be developed by exposure of birds to draughts of air or b} keeping them in damp, filthy and badly-ventilated houses. It is presumable that this belief in its etiology is not well founded because of confusion existing concerning the early symptoms of acute diphtheria and those of all stages of the chronic form, and those of simple colds and catarrhs. Ward was unable to produce the disease by exposing fowls to unfa- vorable conditions, but when infected fowls were introduced Fig. 114. Foi'l s/i07tniig- the suborbital sinus distended. T/ie eye is partially closed. the disease spread rapidly. Dampness and lack of ventilation 110 doubt favor the maintenance of the virus when introduced. The specific cause of the disease known as diphtheria or roup in chickens and pigeons, in the opinion of the writer, is not known. It is not impossible that a number of organisms may share in the production of the lesions of this affection. Guerin considers it a general disease caused by a cocco- bacillus (resembling the fowl cholera organism). This is not unlike the bacterium of septicemia hemorrhagica. He finds
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