It indicated that IgM, the immune globulin produced from the earlier reaction, play active role against the AEV-NH937 strain infection at the beginning of the disease.

• 感染鸡外周血清中先出现IgM，后出现IgG，说明IgM为初级反应最早出现的免疫球蛋白，在感染早期起着先锋免疫作用。