Two pathogens,Mycoplasma gallisepticum (MG) and Haemophilus parallinaum (HPG),were isolated and identified at the same time from 5 samples collected from the chickens infected with respiratory disease in the south area of Hebei Province.By pathogen isolation,L type bacterium test,biochemical test and serological reaction,the serotype of the isolates of MG was proved to be the same as that of MG_S6;and that of the isolates of HPG proved to be serotype A.Typical signs showed respectively in embryoante...
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