Copied from http://www.ncbi.nlm.nih.gov/pubmed/3911893?ordinalpos=1&itool=PPMCLayout.PPMC...
Disinfecting capabilities of oxychlorine compounds.
The bacterial virus f2 was inactivated by chlorine dioxide at acidic, neutral, and alkaline pH values. The rate of inactivation increased with increasing pH. Chlorine dioxide disproportionation products, chlorite and chlorate, were not active disinfectants. As chlorine dioxide solutions were degraded under alkaline conditions, they displayed reduced viricidal effectiveness, thereby confirming the chlorine dioxide free radical as the active disinfecting species.