
Keywords: فیبروبلاست های جنینی مرغ; MD; Marek's disease; MDV; Marek's disease virus; MDV-IS; Marek's disease virus-induced immunosuppression; ILT; infectious laryngotracheitis; ILTV; infectious laryngotracheitis virus; PFU; plaque forming units; CEO; chicken embryo origin; CEF; chicke