What are the symptoms of common swine fever?

1, acute swine fever. The sick pig's body temperature rises to 40-42℃, and it is depressed, afraid of cold and sleepy. Constipation at the beginning of the disease, followed by pasty or watery diarrhea, and the stool stinks; Conjunctivitis, unclean oral mucosa, ulcers or bleeding spots on gums, lips and tongue; In the later stage, bleeding spots or spots appear on the skin of nose, lips, ears, legs, lower abdomen and inner abdomen. Bacterial infections are often secondary, especially pneumonia or necrotizing enteritis.

2. Chronic swine fever. The temperature rise of sick pigs is not obvious; Anemia, emaciation, general weakness, the general course of disease is more than one month, and the appetite is good and bad. Constipation and diarrhea alternately cause skin necrosis or exfoliation of ear tip, tail root and limbs. Survivors of chronic swine fever are severely stunted and become stiff pigs.

3. Atypical swine fever. Also known as subclinical swine fever. The clinical symptoms and anatomical lesions are atypical, the morbidity and mortality are obviously reduced, the course of disease is obviously prolonged, the mortality rate of newborn piglets is high, and big pigs generally tolerate it. Pregnant sows are infected with abortion, fetal mummy, stillbirth and abnormal fetus.

4. Late onset swine fever. It is the sequela of congenital infection. Infected pigs do not show symptoms for a period of time after birth, but appear mild anorexia, inactivity, conjunctivitis and hind limb paralysis several months later, but their body temperature is normal, and they can survive for about half a year and die. Pregnant sows are infected with low virulence classical swine fever virus, which can be manifested as a large number of miscarriages, stillbirths, fetal mummies, malformations and weak piglets with tremor or piglets with healthy appearance and actual infection.