On the pathological types of Duck Cholera

Duck cholera is mainly septic pathological changes, visible to the naked eye as small bleeding on the serosa and mucous membrane. There are needle-sized, gray-white, neat-edged necrotic spots on the surface of the liver; splenomegaly, with necrotic spots of varying sizes on the surface; coronary sulcus, endocardium, epicardial hemorrhage and pericardial effusion; pulmonary congestion and hemorrhage; duodenal and rectal mucosal bleeding, intra-abdominal, gastric and mesenteric fat surface bleeding.

1. The most acute type

The most acute type died quickly, and there were no obvious pathological changes in autopsy.

two。 Acute type

Septicemia was the main change in acute cases. The bleeding of the duodenum is the most severe, with severe acute catarrhal enteritis or hemorrhagic enteritis, with blood in the intestinal contents; enlarged liver, lightened color, slightly hard texture, scattered yellow or gray necrotic spots the size of a needle tip, slightly enlarged spleen, soft quality, punctate or patchy hemorrhage under the epicardium or subserosa, pericardial effusion, occasionally mixed with fibrous clots. The lungs are congested with bleeding spots on the surface and sometimes pneumonia; the ovaries of laying ducks often have a loose appearance of mature follicles and blurred blood vessels on the surface.

3. Chronic type

Chronic lesions vary depending on the organs invaded by the bacteria. Some show effusion in the nasal cavity and upper respiratory tract, while others accumulate turbid or cheese-like exudates in the joints and tendon sheaths. Obvious changes often occur in the ovaries of female ducks. the eggs are irregular in shape and soft in texture, and sometimes a light green egg can be seen. There is a solid, yellow cheese-like substance around the ovary, which sometimes sticks to the surface of the internal organs. The liver is slightly swollen and yellowish. The texture is fragile, the surface is covered with grayish-yellow necrotic spots the size of a needle, the gallbladder is swollen and filled with green oily fluid; there are bleeding spots and superficial ulcers under the cornea. There are bleeding spots in the epicardium, obvious pericardial effusion, yellowish, transparent and mixed with cellulose.