Bahl A K, Pomeroy B S, Mangundimedjo S, Easterday B C
J Am Vet Med Assoc. 1977 Nov 1;171(9):949-51.
Twenty-seven chicken red blood cell agglutinating agents were isolated from 187 tracheal swabbings of apparently healthy migratory mallard ducks (Anas platyrhynchos) in the Mississippi flyway. Twenty-four of the isolants were type A influenza virus; 3 lentogenic Newcastle disease viruses were isolated. Isolations were not made from either 65 giant Canada geese (Branta canadensis) or 60 Franklins' gulls (Larus pipixcan).
从密西西比飞行路线上187只看似健康的迁徙绿头鸭（Anas platyrhynchos）的气管拭子中分离出了27种鸡红细胞凝集剂。其中24种分离株为甲型流感病毒；分离出3种缓发型新城疫病毒。65只加拿大黑雁（Branta canadensis）和60只富兰克林鸥（Larus pipixcan）均未分离出病毒。
