R75761, a lead compound for the development of antiviral drugs in late stage poliomyelitis eradication strategies and beyond.

In this study the antiviral activity of a panel of 18 out of 240 pyridazinamine analogues was evaluated against the Sabin strains of the three poliovirus types. We found one compound, R75761 which had a comparable 50% effective concentration (EC50) value against all three poliovirus Sabin strains. Virus multiplication was reduced by 10(4.0)-fold, 10(6.2)-fold and 10(6.6)-fold for poliovirus type 1, type 2 and type 3, respectively. R75761 could be considered as a lead compound for development of anti-poliovirus drugs to be used during the late stage of poliovirus eradication and beyond.