| 標題（洋） | | The development of new polio live vaccine by using biotechnology 1)In Vitro Phenotypic Markers of a Poliovirus Recombinant Constructed from Infectious cDNA Clones of the Neurovirulent Mahoney Strain and the Attenuated Sabin 1 Strain2)An Infectious cDNA Clone of the Poliovirus Sabin Strain Could Be Used asa Stable Repository and Inoculum for the Oral Polio Live Vaccine |