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Peritonitis
Peritonitis is the inflammation of the duck's peritoneum, resulting from egg components moving incorrectly through a her body that end up deposited in her abdomen. Peritonitis is more common in overweight ducks, those with a genetic predisposition and among those who lay eggs excessively—commonly brought on by over-mating or excessive quantities of laying formulas.
Isolate the bird from the flock and place in a safe, comfortable, warm location (your own duck "intensive care unit") with easy access to water and food. Limit stress. Call your veterinarian.