When 293 cell line, human embryonic kidney cells transformed by adenovirus type 5 DNA, was infected by BK virus (BKV ), a widespread human papovavirus-the initial cytopathic effects (CPE ) occurea in 7 days and the complete CPE, in 3 weeks.

• 293细胞系乃是由腺病毒5的DNA转化的人胚肾细胞；被BK病毒(BKV；一种广泛分布的人类乳多空病毒)感染后；七天内出现最早的细胞病变；三周后可见完全的细胞病变.