In the hyperacute course of the disease, animals die suddenly (within 2-3 hours), clinical signs usually do not appear. This form of the disease is observed mainly in young and well-fed sheep. Dead animals are more often found in the sheepfold or pasture in the morning. Sick sheep stop grazing, they are oppressed, they fall behind the flock.
Body temperature is normal or slightly elevated, the pulse is weak, rapid. The coordination of movements is disturbed, the animal stumbles, sometimes moves on carpal joints, falls, makes swimming movements with its limbs, serous or serous-hemorrhagic mucus is released from the mouth and nose, salivation is observed. Increased urination.