News briefing： duck head

The incubation period of duck swollen head disease is 3 ~ 6. Sudden onset, Sullen, lethargic, shaggy coat, loss of appetite; dyspnea, rapid agitation of chest and abdomen. Tears, moist feathers around the eyes, followed by swelling of the head, nose, eyes, fluid or bloody secretions; body temperature above 43 °C, a large amount of drinking water; diarrhea, the first discharge of Pale sparse feces, back row of grass green or dark green sparse feces, rapid death. Some ducks have neurological symptoms, leg paralysis, difficult to walk, rush forward when the wings, a jumping movement. Diffuse petechial hemorrhaging throughout the body. Eye Tears around the eye feathers, eye conjunctival congestion, after hemorrhagic necrosis; head and Neck Edema, with yellow gel-like or bloody gush; thymus bleeding, necrosis point; liver swelling degeneration, Dark Brown, diffuse bleeding; endocardial bleeding, myocardial necrosis; Bleeding of kidney, lacuna bleeding of esophagus Mucosa, diffuse bleeding and necrosis of intestinal Mucosa, covered with cellulose pseudomembrane in late stage, initial bleeding of cloacal cavity, necrosis after, covered with yellow-green pseudomembrane.