Symptoms of influenza?

summary

Duck influenza, or duck influenza, is caused by a virulent strain of avian influenza virus A. The strains of ducks are characterized by respiratory symptoms, neurological symptoms, high incidence rate, pericarditis, multiple white necrosis of the pancreas, or transparent or liquefied necrotic foci or necrotic foci, and the female ducks. High incidence rate, low mortality rate and sharp drop in egg production are the main features of viral infectious diseases. In recent years, especially in southern China, the incidence and prevalence of duck avian influenza, especially Muscovy Duck flu, are more serious. Let's talk about it.

Symptoms of influenza?

(1) The epidemiological characteristics of this disease have been reported in the developed duck industry countries, but in most countries, it only causes mild respiratory symptoms or asymptomatic, only infected ducks. The resistance of type A avian influenza virus is not strong. Many common disinfectants can kill it quickly. Sick ducks and infected ducks are the main sources of infection. Generally speaking, the duckling is susceptible to infection through 2~6. The incidence rate and mortality rate are related to virulence of virus strains and secondary diseases.

(2) The main pathological changes on autopsy were inflammation of nasal mucosa, filled with serous or mucus in nasal cavity and infraorbital sinus, and caseous in some cases. The mucous membrane of nasopharynx and trachea is hyperemia, the air sac is turbid, edematous or has cellulosic inflammation.

The clinical symptoms of the diseased (dead) ducks were as follows: lethargy, tears, nervous symptoms (twisting neck in "s" shape or similar to arcuate or lying on the side, lying on the back or drawing water or rushing to the side), dyspnea (breathing with open mouth), diarrhea (discharging white or greenish thin feces). In addition to individual death, the egg production of laying ducks and breeding ducks also decreased sharply (from 90% ~ 95% to about 10%), Even stop production), abnormal egg production (thick shell egg, soft shell egg, abnormal egg), etc

matters needing attention

When the above symptoms and changes in autopsy, should immediately report to the veterinary administrative department for diagnosis.