There were some unclassified viruses, which could grow in L20B cells, but the CPE was different from that of the poliovirus and was similar to adenovirus.

• 部分不能确定型别的病毒除了能在RD、Hep - 2细胞生长外 ,还能在L2 0B细胞上生长 ,其细胞病变与“腺病毒”相类似 ,但与脊灰病毒在L2 0B细胞上的细胞病变效应明显不同。