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A laboratory test system specific for Marek's disease was developed by using the pathological response of the chicken embryo. Chicken epidermal scales (dander) and feather calami from infected chickens contain an agent(s) which after a 3- to 4-day incubation period caused gross or microscopic pathological changes (or both) in the embryo. A cell-free inoculum was obtained from infectious dander by 5-min sonic treatment, differential centrifugation, and membrane filtering (0.45 μm). Evidence for the cell-free existence of this agent(s) was obtained when membrane filtrates of dander preparations were shown to cause Marek's disease in 10-day-old chickens and in chickens inoculated at 1 day of age.

Pathological Response of the Chicken Embryo to an Agent Which Causes Acute Leukosis (Marek's Disease)