Average numbers of aa mutations within IRRDR[2a], ISDR/+C[2a] and IRRDR/N[2b] of HCV NS5A obtained form pre-treated sera of HCV-2a and -2b-infected patients with SVR, non-SVR, RVR and non-RVR.

*Mean ± S.D.Abbreviations: SVR, sustained virological response; RVR, rapid virological response; IRRDR[2a], interferon/ribavirin resistance-determining region of HCV-2a; ISDR/+C[2a], part of interferon sensitivity determining-region plus its carboxy-flanking region of HCV-2a; IRRDR/N[2b], an N-terminal part of interferon/ribavirin resistance-determining region of HCV-2b.*均数±标准差（Mean ± S.D.）。缩略语：SVR（持续病毒学应答，sustained virological response）；RVR（快速病毒学应答，rapid virological response）；IRRDR[2a]（HCV-2a型干扰素/利巴韦林耐药决定区，interferon/ribavirin resistance-determining region of HCV-2a）；ISDR/+C[2a]（HCV-2a型干扰素敏感决定区的一部分及其羧基侧翼区域，part of interferon sensitivity determining-region plus its carboxy-flanking region of HCV-2a）；IRRDR/N[2b]（HCV-2b型干扰素/利巴韦林耐药决定区N端片段，an N-terminal part of interferon/ribavirin resistance-determining region of HCV-2b）。