Symptoms and pathological changes of salmonellosis in ducks

1. Symptom

Infected duck eggs are infected with salmonella or hatched ducklings are infected with bacteria in the incubator, often showing septicemia and dying quickly without showing any symptoms. Older young birds often have a subacute process. Lethargy, drooping head and eyes, drooping wings, loose feathers, significant anorexia, increased drinking water, watery dysentery, fecal adhesion to the anus, fear of cold and close to the heat source or crowding each other. Respiratory symptoms are not common. Ducklings appear trembling, wheezing and eyelid edema and other symptoms, often suddenly fall to the ground and die, so it is known as "sudden collapse disease".

two。 Pathological changes

When the ducklings were infected with salmonella, the liver was significantly enlarged and bronzed, with gray necrotic foci. The airbag showed slight turbidity with yellow fibrin-like spots. A cheese-like substance is formed in the cecum, and the rectum is enlarged with bleeding spots. There are pericarditis, pericarditis and myocarditis. Under natural conditions, adult ducks are generally chronic carriers and often have no symptoms. Germs are found in internal organs and intestines. Acute cases are rare, and sometimes there are symptoms such as watery dysentery, mental depression, burnout, drooping wings, loose feathers and so on. Acute infection showed congestion and swelling of liver, spleen and kidney, hemorrhagic or necrotizing enteritis. Pericarditis and peritonitis. In spawning ducks, necrosis and proliferation of fallopian tubes, necrosis and suppuration of ovaries can be seen, and this lesion often extends to peritonitis. Adult ducks with chronic infection, especially those with intestinal bacteria, often have no obvious pathological changes. The most acute death of the sick duck, there is no lesion at all.