Diagnosis and treatment of Porcine Influenza in Winter and Spring

Porcine influenza is an acute and highly contagious respiratory organ infectious disease, which occurs suddenly, spreads rapidly and has a high incidence. The outbreak of the disease is easy to occur in winter and spring due to sudden change of climate, extensive feeding and management, malnutrition of pigs and decline of resistance.

1 epidemic characteristics

The seasonality is obvious, which mostly occurs in autumn, winter and spring when the temperature changes suddenly. All kinds of pigs can be infected. The virus is present in nasal juice, tracheal and bronchial exudates, lungs and pulmonary lymph nodes of infected pigs. Mainly through the air, droplets transmission, through respiratory tract infection, the disease spreads very quickly. Generally, the morbidity is high and the fatality rate is low. Such as secondary Pasteurella multocida, Streptococcus pneumoniae and other infections, it aggravates the disease and causes greater economic losses.

2 clinical symptoms

The disease incubation period can be up to 1 week, body temperature can be as high as 40 ℃ or so, diseased pig appetite or abstinence, high mental depression, muscle and joint pain, hardening, unwilling to stand, walking difficulties, fast and shortness of breath, like to show abdominal or dog sitting type, mixed with paroxysmal cough, runny nose, serous, and then turn sticky and purulent; generally 2 days after 6 days can be completely recovered, the fatality rate is not high.

3 main points of diagnosis

3.1 pathological changes. According to the epidemic characteristics of sudden onset and rapid spread of the whole group, persistent high fever and respiratory symptoms are the main clinical symptoms, combined with autopsy changes can be diagnosed. Pathological examination mainly showed that the respiratory organs, nose, throat, trachea and bronchial mucosa were congested, there was a lot of mucus on the surface, sometimes the bronchi were blocked by viscous exudate, the gastrointestinal tract was dominated by blood stasis, and the bleeding was not obvious.

3.2 differential diagnosis. The diseased pigs showed fever, cough and runny nose, and the lesions were mainly concentrated in the bronchi and lungs. Local epidemic bronchopneumonia of piglets only infects piglets, its infectivity is much less than porcine influenza, and the clinical process is not too urgent, mostly subacute or chronic, with symptoms such as dysentery and skin eczema; there are no hyperemia or hemorrhagic erythema and red spots on the skin of porcine influenza, no vomiting and significant gastrointestinal disorders. Pneumonic disease is mainly hemorrhagic and septic disease of the whole body, there are bleeding spots and bleeding spots in skin, serosa and mucous membrane, swollen and bleeding lymph nodes, porcine influenza is catarrhal symptoms in all respiratory system mucosa, nasal cavity, trachea and bronchus all have this kind of change. lymph node swelling.

4 Preventive measures

4.1 strengthen feeding management, do a good job in environmental sanitation and disinfection in pig houses, especially supply vitamins, take sulfonamides prevention if necessary, and add multi-dimensional minerals.

4.2 keep the piggery dry and clean, pay attention to ventilation in summer and keep warm in winter.

4.3 isolate sick pigs as soon as possible and carry out strict and thorough disinfection to prevent the further spread of the disease.

5 treatment regimen

5.1 the preferred drug is amantadine hydrochloride. It can prevent the virus from entering the cell, causing the influenza virus to die due to lack of nutrition.

5.2 when pigs show influenza-like symptoms, intramuscular injection of porcine leukocyte interferon supplemented with antibiotics and vitamins B and E can effectively control secondary infection. Secondary infection can be treated with penicillin potassium powder injection (4 million), virus injection, Zhongmei Jindian injection and so on.

5.3.After mixing antiviral I powder (400kg material / bag) and doxycycline 300mg/kg into the feed for 10 days, and adding electrolytic multi-dimension to the drinking water, the whole group could return to health after 3 days.

5.4.The Yadak Refast injection and Materia Medica Holy Needle injection are available with high fever, one each per 50kg body weight, twice a day.

5.5 Fangbaidu Powder has a special effect in preventing swine influenza, which can be used in combination with actual use according to the instructions.

5.6 the pigs with severe course of swine influenza should be supplemented with Daqing Leaf and Bupleurum injection with good effect. Amantadine injection can also be used. To prevent secondary infection, antibiotics should be used at the same time.