Amino acids contributing to antigenic drift in the infectious bursal disease Birnavirus (IBDV)
Keywords: برن ویروس; IBD; infectious bursal disease; IBDV; infectious bursal disease virus; RT-PCR; reverse transcriptase- polymerase chain reaction; B-BW; bursa body weight; SPF; specific pathogen free; hvVP2; hypervariable sequence region of viral protein 2; Infectious burs