TY - JOUR T1 - An Overview on Marek’s Disease Virus Evolution and Evidence for Increased Virulence in Brazil JO - Brazilian Journal of Poultry Science A1 - Torres, ACD A1 - Marin, SY A1 - Costa, CS A1 - Martins, NRS SN - 1516-635X UL - 10.1590/1806-9061-2018-0870 VL - 21 Y1 - 2019 PB - Brasil ER -