This inflammation, which quickly develops into Ulcers, is one of the principal and most frequently observed lesions.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
If animals which have died of this disease are examined, in addition to the changes of the mucous membrane of mouth and nasal cavities referred to above, shallow Ulcers in these situations will be found occasionally.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
In cows the mucous membrane of the vestibule is congested, swollen, and may contain Ulcers and an excessive quantity of mucus.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler