Acute swine fever often has no obvious symptoms, and pigs suddenly die. The pig's body temperature rose to 465,438+0 ~ 42℃, and its appetite decreased, its mood was depressed, its eyes and nasal mucosa were congested, and it was extremely weak. The course of disease 1 ~ 2 days, and the mortality rate is extremely high. In addition to not eating, poor spirit, prone, hunchback, chills and fatigue, other typical symptoms include conjunctival inflammation, purulent secretions, and sometimes a small amount of conjunctival bleeding. Inflammation of nasal mucosa with purulent secretion. Constipation and black stool at the beginning of the disease, such as abacus beads. Diarrhea, foul smell, mucus or blood in feces in the late stage of illness. Purple spots of different sizes can be seen on the nose, behind the ears, abdomen and inner limbs of sick pigs, and the finger pressure does not fade; Boars have dermatitis, so they squeeze foul-smelling turbid liquid with their hands and shoot it out. Oral mucosa is unclean, pale or cyanotic, and there are bleeding spots on the inner surface of lips, gums and corners of the mouth. Piglets are accompanied by neurological symptoms. When stimulated by the outside world, they will scream, fall to the ground and twitch.