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Nasodine nasal spray was applied to biofilms of Staphylococcus aureus grown in vitro to determine its antibiofilm efficacy. When Nasodine was applied to intact biofilm, near complete eradication was observed at six hours of exposure. Bacterial biofilms on the sinonasal mucosa, especially biofilms of Staphylococcus aureus, are associated with greater severity and recalcitrance of chronic rhinosinusitis (CRS). Unfortunately, there are few, if any, antibiofilm agents suitable for sinonasal application available for the management of this problem. The study investigated the antibiofilm efficacy of Nasodine to determine whether it may be a candidate for the treatment of biofilm-associated CRS. Nasodine demonstrated time- and concentration-dependent bacterial killing against intact biofilms. Statistically significant reductions in viable bacteria from intact biofilms were seen with exposures as brief as 5 min. Nasodine consistently eradicated dispersed biofilm within 1 min. Nasodine is highly active against biofilms of S. aureus ATCC 6538 in vitro. Therefore, biofilm killing is impeded by the presence of the intact biofilm structure.
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