Archive image from page 517 of The pathology and differential diagnosis The pathology and differential diagnosis of infectious diseases of animals differentpathology00moorrich Year: 1908 492 DIPHTHERIA IN FOWLS In fowls which die, the exudates are for the greater part in the advanced stage, although fatal cases occur in which the lesions are restricted to an abnormal quantity of a serous or muco-purulent, more or less viscid, exudate in the conjunctiva or nasal cavities. The best illustration of the diphtheritic process is found in fowls killed for ex- amination in the second stage of the di
Archive image from page 517 of The pathology and differential diagnosis The pathology and differential diagnosis of infectious diseases of animals differentpathology00moorrich Year: 1908 492 DIPHTHERIA IN FOWLS In fowls which die, the exudates are for the greater part in the advanced stage, although fatal cases occur in which the lesions are restricted to an abnormal quantity of a serous or muco-purulent, more or less viscid, exudate in the conjunctiva or nasal cavities. The best illustration of the diphtheritic process is found in fowls killed for ex- amination in the second stage of the disease. The distribution of the lesions shows that the conjunctiva is most fre- quently affected. The exudate in the nasal cavities is in some cases undoubt- edly the result of the coagulation of the liquid which has passed during the course of the first stage from the con- junctiva through the lachrymal duct into the nares. In certain cases, however, the lesions appear in the nares primarily. In some cases the exudate appears in the larynx and extends down into the trachea. In these cases the fowls are liable to die from suffocation. It occa- sionally happens that the lesions are restricted to the larynx and as the fowls die suddenly the cause of death is not suspected. Sections of the exudate with subjacent tissues from the cornea and the mouth, show that there is a cell infiltration into the mucosa which destroys the epithelial layer and frequently the sub- mucous tissues to a considerable depth. The fact should not be overlooked that the disease in the eye is usually confined to the conjunctiva and the cornea, the posterior portion remaining apparently normal. Mack in his work on thirty-three cases found 40 per cent had lesions in the conjunctiva ; in 44 per cent the nasal mucosa was affected ; in 41 per cent the mouth was invohed and in 33 per cent the suborbital sinuses were distended with exudates. Fig. 117. A drazviuo- shoii'ing areas of diph- theritic in the
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