In two preferred embodiments, the RNA virus is the ScVL1 virus or the ScVLa virus of Saccharomyces cerevisiae.

RNA viruses have generated many celebrities; HIV is an RNA virus, as are SARS and influenza.

According to the invention, nucleic acid sequences which are relevant to the diagnosis are inserted into the genome of an RNA virus or an RNA phage, or segments are substituted.

But for RNA viruses, their hereditary information is RNA, and the extremely high RNA virus mutation rate is a powerful engine of evolution.

These antiviral substances make cell avoid of the attack from virus, the influenza virus and the single strand plus RNA virus are preferred, such as hepatitis C virus, dengue virus and Japanese encephalitis virus.