Experimental groups were innoculated with three strains of reticuloendotheliosis virus (REV T, REV DIA and REV C 45 ) 0.5 mL/bird respectively, and the control group was injected with same amount normal saline.

• 试验组分别腹腔接种3株禽网状内皮组织增殖病病毒（REV－T、REV－DIA和REV－C45），0.；5mL/羽； 对照组注射等量生理盐水。