Porcine pneumonia, also known as swine pasteurellosis and hemorrhagic septicemia, is an acute febrile septic infectious disease caused by Pasteurella multocida of a specific serotype. Most of them occur in spring and autumn, generally sporadic, and often complicated with diseases such as swine fever and erysipelas. The incubation period of the disease is 1 ~ 5 days.

According to its course, it can be divided into three types: the most acute, acute and chronic.

The most acute type of swine pneumonia is sepsis. The temperature of the sick pig suddenly rises to 465,438 0 ~ 42℃, and it is difficult to breathe, the heartbeat is accelerated, and the oral cavity and nasal mucosa are cyanotic. Hemorrhagic erythema appeared at the root of ear, neck and abdomen. The throat is swollen, hard and burning. Sick pigs sit in the posture of dogs, and most of them die within a few hours to a day. Some people eat and drink normally the night before, have no clinical symptoms, and die in circles the next morning.

Acute fibrous pleuropneumonia. The body temperature rises to 40 ~ 4 1℃, with dyspnea, short dry cough, runny nose, asthma and liquid or purulent conjunctivitis. Red and purple bleeding spots appeared on the skin. Constipation at the initial stage of onset, followed by diarrhea, is often prohibited within 2 ~ 3 days. Immortality becomes chronic.

Chronic type is mainly manifested as chronic pneumonia or chronic gastroenteritis. The initial symptoms are not obvious, but if it continues to develop, it will lead to loss of appetite, listlessness, diarrhea and emaciation. Or persistent cough, dyspnea, sticky or purulent secretions from nostrils from time to time, walking weakness, sometimes skin scabs and eczema, joint swelling and limping. If not treated, it often fails and dies 2 ~ 3 weeks after onset.

Due to different types of diseases, the lesions are also different. The most acute is septic change, and there are a large number of bleeding spots in mucous membrane, serosa and subcutaneous tissue and endocardium of the whole body. The most prominent cases are throat edema, hemorrhagic serous infiltration of surrounding tissues, pulmonary congestion, hemorrhage and edema, serous hemorrhagic inflammation with swollen lymph nodes. The main change of acute type is fibropleuropneumonia, with pneumonia focus and necrosis focus in various stages, and the lung section is marble-like. In chronic cases, there are multiple necrotic foci in the lung, and there are cheese-like substances after incision.

[Preventive and Control Measures]

(1) Strengthen feeding management, eliminate factors that may reduce disease resistance, and regularly inoculate aluminum hydroxide formaldehyde vaccine or oral attenuated vaccine for pig lung disease twice every spring and autumn. The former was injected subcutaneously with 5 ml, and immunity was generated 14 days after injection, while the latter could be smeared according to the requirements of bottle label, and immunity was generated 7 days after injection.

(2) Antibacterial drugs such as penicillin, streptomycin, neomycin and oxytetracycline can be used for treatment. Penicillin, 10000 unit/kg, intramuscular injection, twice a day for 3 days; Streptomycin, per kg body weight 10000 unit, intramuscular injection, twice a day, for 3 days.