**2.3 Efficacy of DHP for inactivating viruses**

Hydrogen peroxide's biocidal action against viruses relies on the oxidation of essential biomolecules that compose the external structures of the virus (i.e. lipid envelope, protein capsid, etc.) [2–4]. Both enveloped and non-enveloped viruses are susceptible to this mechanism, even though non-enveloped viruses are decidedly less susceptible [25]. A recent study indicated that DHP effectively reduced infectious burden of the enveloped coronavirus SARS-CoV-2 on surfaces in a laboratory setting, achieving an estimated 98.7% (1.94 log10) reduction compared to the corresponding control condition after 120 minutes in a simulated room environment [26]. Dry Hydrogen Peroxide was also associated with significant surface reductions in bacteria in two separate studies conducted in active hospital patient rooms [17, 27]. While these studies address DHP's efficacy against bacteria and enveloped viruses on surfaces, there have not yet appeared in the literature peer-reviewed reports detailing the efficacy of DHP against non-enveloped viruses or airborne enveloped viruses. The following sections will detail three previously unpublished laboratory trials that investigated DHP's potential for inactivating airborne viruses or viruses dried on surfaces.
