Salivation and lameness, due to vesicles in the mouth and between the claws, are evident. By opening the mouth vesicles may be seen on tongue, palate and other places - or the vesicles have ruptured and left open, bleeding wounds. The fluid contents of the vesicles are highly infective. The ulcers normally heal in 1-2 weeks. The udder may be affected, with vesicles on the teats and on the udder itself.
Infected milk yielding animals show a rapidly decreasing milk production.
Young animals may be infected by suckling milk from such cows. Abortion and infertility may also be seen after recovery from acute disease. Although only a few animals die, losses from reduced production during the acute outbreak, and from the diseases following later, are normally large. Your cow takes only liquid food or stops eating . The blisters break and can become bleeding ulcers.