Abstract
ALTHOUGH chronic respiratory disease (CRD) in chickens and turkeys has been described on many occasions, little attention has been paid to a similar condition occurring in ducks. Dougherty and Fabricant (1953) have shown that CRD “agents” isolated from chickens or turkeys will not cause CRD in ducks and furthermore, that the reported causative agent of “New Duck Disease,” Pfeifferella antipestifer will not cause CRD in chickens. This preliminary report describes an outbreak of a chronic respiratory disease in ducks from which two different agents were isolated.The outbreak occurred on a commercial duck farm in Ontario consisting of 2000 breeders and 10,000 young ducks of various ages. The disease was first noticed in a group of 2 week old ducklings and was characterized by depression, sneezing and some head shaking in the majority of birds. Approximately 2–3% of the affected birds were suffering from sore eyes similar to that …
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