Hwang J, Mallinson E T, Yoxheimer R E
Avian Dis. 1975 Apr-Jun;19(2):382-4.
During the 7-year period 1968-74 cases of duck virus enteritis (duck plague) were diagnosed in waterfowl in Pennsylvania. Muscovy ducks were affected in 8 cases, geese in 3 cases, and mallard ducks in 1 case. In 5 of these cases either domestic or wild ducks were closely associated with infected waterfowl but were unaffected.
在1968年至1974年的7年期间，宾夕法尼亚州的水禽中诊断出鸭病毒性肠炎（鸭瘟）病例。番鸭有8例感染，鹅有3例感染，绿头鸭有1例感染。在这些病例中，有5例的家鸭或野鸭与受感染的水禽密切接触，但未受影响。
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