NAVLE® Question of the day

Several 12-month-old sheep and goats are sick at a petting zoo that has cows, horses, pigs, bison, and white-tailed deer. One of the deer is also affected. The rest of the animals appear well.

Affected sheep are febrile, listless, and off-feed, with serous or mucopurulent nasal discharge and rectal temperatures ranging from 105-107.5°F (40.5-42°C) [N=100.9–103.8°F (38.3–39.9°C)].

Physical exam shows swollen muzzles with edema and congestion of the lips, nose, and face with small hemorrhages and ulcers on the mucous membranes. The ulcers appear where the teeth contact the swollen lips and tongue.

Two affected animals are lame.

What is the diagnosis?

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