RNAi is an efficient antiviral system, and viral gene-specific siRNAs are very promising antiviral inhibitors. However, many viruses have evolved highly sophisticated mechanisms that interfere with both siRNA- and miRNA-guided silencing pathways. Deeper understanding the strategies exploited by viruses provides the basis for the development of effective RNAi-based therapies that prevent viral evading. Therefore, the latest progress on the strategies exploited by viruses for evading the RNAi is reviewed.

Objective To explore operation method,skills,and curative effect of orthophofia microscope discectomy(OMD)for the treatment of lumber disc herniation.Method Retrospective analysis of the 64 patients(74 herniated discs)of lumbar disc herniation heated by OMD,which included 38 segments posterior-lateral extrusion,32 segments central type herniated,and 4 segments extra-lateral extrusion.Resuits All patients were followed-up 6 to 8 months,average 7 months,54 cases were good and 4 cases were fair and no case was bad according to the Nakai scale.The choiceness rate was 93.75%,and no serious complications.Conclusions Orthophoria microscope discectomy has a better third dimension,good operation field of vision,less invasion and best clinical curative effect.Orthophoria microscope discectomy may be the best way of discectomy for the treatment of lumber disc hemiation.