infectious bronchitis (ib) is an economically important disease of chickens. due to the emergence of new variants of infectious bronchitis virus (ibv), the control of ib has become a serious problem for the poultry industry worldwide. in the present study, the nucleocapsid gene (n) and 3' untranslated region (utr) of two ibvs isolated from iranian poultry farms were sequenced and compared with ...
