(1) the most acute type
Sudden onset, sometimes without symptoms and sudden death. If the course of the disease is a little longer, the body temperature reaches 40 to 42 ℃, high respiratory difficulty, loss of appetite, general weakness, lying on the ground, the throat is swollen, there is heat and pain, and in severe cases, it can be extended to the root of the ear and the neck, the mouth and nose out of the foam, in a dog sitting position. Because of the main symptoms of swelling of the throat and breathing difficulties, it is also known as "lockjaw wind".
(2) acute type
The main manifestation of acute pleuropneumonia, sick pigs with elevated body temperature, dry cough, nasal fluid and purulent eye droppings, respiratory difficulties, the first constipation, diarrhea, the late skin with purple spots, the sick pigs wasting weak, lying down, the disease duration of 5 to 8 days, not dead to chronic.
(3) chronic type
Mostly seen in the late epidemic, mainly manifested as chronic pneumonia or chronic gastroenteritis symptoms, persistent coughing, respiratory distress, loss of appetite, gradual wasting, and finally diarrhea, more than 2 weeks due to the debilitation and death.