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**a mass of necrotic debris
**a mass of necrotic debris
**polymorphs and fibrin is found overlying severely inflamed subepithelial tissues in which bacterial colonies may be seen and around which there may be marked fibrosis in an attempt to “wall off” the lesion.
**polymorphs and fibrin is found overlying severely inflamed subepithelial tissues in which bacterial colonies may be seen and around which there may be marked fibrosis in an attempt to “wall off” the lesion.
[[Image:Necrotising laryngitis.jpg|right|thumb|100px|<small><center>Necrotising laryngitis (Image sourced from Bristol Biomed Image Archive with permission)</center></small>]]
[[Image:Tracheitis in calf diphtheria.jpg|right|thumb|100px|<small><center>Tracheitis in calf diphtheria (Image sourced from Bristol Biomed Image Archive with permission)</center></small>]]
*Synonyms: '''laryngeal diphtheria, calf diphtheria'''
*Common disease in cattle, and can occur in swine
*Caused by infection with [[Fusobacterium|''Fusobacterium necrophorum'']]
*Lesions may also be found in other parts of the [[Nasopharynx Inflammatory - Pathology#Infectious causes of pharyngitis|oropharynx]]
*The bacterium usually gains entry through damaged mucosal surfaces e.g. after viral infections or injury following (poor!) use of dosing guns, coarse poor quality roughage
*Results in severe acute neutrophilic [[Larynx Inflammatory - Pathology#Infectious causes of laryngitis|laryngitis]]
*Extensive accumulation of fibrin and necrotic cellular debris on the ulcerated mucosal surface
*Lesions appear as dry plaques of fibrinonecrotic exudate and ulceration on the laryngeal mucosa
*Inhalation of exudate and bacterial organisms may cause [[Bronchi and Bronchioles Inflammatory - Pathology#Infectious causes of bronchitis or bronchiolitis|broncho]][[Lungs Inflammatory - Pathology#Infectious causes of pneumonia|pneumonia]]
*Death may result from toxaemia or asphyxiation
*Also may occur in pigs
[[Category:Tongue_-_Pathology]][[Category:Cattle]][[Category:To_Do_-_Clinical]]
[[Category:Tongue_-_Pathology]][[Category:Cattle]][[Category:To_Do_-_Clinical]]