| Summary |
Twenty-one cases of fowl cholera of ducks were collected in Taiwan from July, 1993 to June, 1994. The average age of these ducks is 58=21 days old. Their morbidity ran2es frem 2.7 to 42%. The average fatality is 66±231 %. The pathological lesions include hemorrhage in heart, focal necrosis of livere and spleen. mucosal hemorrhage on intestine mucosa and hemorrhage in intestinal annular bands. Different doses of 4 selected strains ofPasteurellamultocida (Pm.) were jnjected intramuscularly into experimental ducks in order to observe the pathological changes. especially the annular band necrosis. The results indicate that the annular band necrosis can be induced by P.m only, Which is related to Bacterial dose. In conclusion, the annular band ecrosis not the pathognomonic change induced by duck plague virus.
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