What are the symptoms of swine flu?

The incidence of swine flu is high, the incubation period is 2-7 days, and the course of disease is about 1 week. In the early stage of the disease, the sick pig suddenly has a fever, lethargy, loss of appetite or abstinence, often lying together, unwilling to move, dyspnea, intense cough and mucus from the eyes and nose. If the disease is not treated in time, it is easy to be complicated with bronchitis, pneumonia and pleurisy, which increases the fatality rate of pigs.

The body temperature of diseased pigs increased to 40 ℃ ~ 41.5 ℃, depressed spirit, loss of appetite or lack of food, muscle pain, reluctance to stand, viscous fluid outflow from eyes and nose, conjunctival congestion, dyspnea, wheezing, coughing, abdominal breathing, dog sitting posture, asthma sound of diseased pigs could be heard at night, joint pain of individual diseased pigs, especially in pigs with good fat condition.

Autopsy showed that the larynx, trachea and bronchi were filled with mucus containing bubbles, mucous membrane hyperemia, swelling, sometimes mixed with blood, pulmonary interstitial enlargement, lymph node enlargement, congestion, splenomegaly, catarrhal hemorrhagic inflammation in gastrointestinal mucosa, accumulation of cellulosic fluid in chest, abdominal cavity and pericardium.

Pigs of all ages, genders and breeds are susceptible to swine influenza virus. The epidemic of swine flu has obvious seasonality, and it is easy to occur in late autumn, early spring and cold winter. Swine flu spreads rapidly and is often endemic or pandemic. The incidence of swine flu is high and the mortality rate is low (4% to 10%). Sick pigs and infected pigs were the source of infection of swine influenza, and pigs were infected for 6 to 8 weeks after recovery from the disease.

The incubation period of swine flu is very short, from a few hours to a few days, with an average of 4 days at the time of natural onset. At the initial stage of the disease, the body temperature of diseased pigs suddenly rose to 40.3 to 41.5 ℃, anorexia or loss of appetite, extreme weakness and even collapse, often lying on the ground. Shortness of breath, abdominal breathing, paroxysmal cough. Mucus flows from the eyes and nose, and nasal secretions are sometimes bloody. Sick pigs lie together, difficult to move, touch muscle stiffness, pain, diaphragm spasm, respiratory setbacks, commonly known as hiccups. If there is a secondary infection, the disease is aggravated, resulting in fibrinous hemorrhagic pneumonia or enteritis. Sows are infected during pregnancy, and piglets are seriously ill 2-5 days after delivery, and some die during lactation and before and after weaning.