| molecular characterization of seven chinese isolates of infectious bursal disease virus: classical, very virulent, and variant strains. | seven infectious bursal disease virus (ibdv) strains isolated from china have been characterized in this study, including a classical strain cj801, an attenuated strain gz911, a variant strain gz902, and four very virulent strains g9201, g9302, f9502, and hk46. with the use of reverse transcription-polymerase chain reaction, the full-length vp2 genes were amplified and the hypervariable regions were sequenced. protein sequences of the hypervariable region (a.a. 143-382) of the field isolates con ... | 1998 | 9645325 |