This link discusses ozone, and what it does.  Some references to virus include the following:

-- Ozone is generated on site and on demand to neutralise (oxidise) all substances harmful to humans like micro-organisms, viruses, bacteria, fungi and kills impurities and odours in the air and water.

-- There is no masking and disguising of the problem odour, chemical or virus/bacteria, it is destroyed completely by biological breakdown of its structure.

-- Effective on cold tolerant viruses, etc. wet or dry conditions.

-- Viruses are small, independent particles, built of crystals and macromolecules, Unlike bacteria, they multiply only within the host cell. They transform protein of the host cell into proteins of their own. Ozone destroys viruses by diffusing through the protein coat into the nucleic acid core, resulting in damage of the viral RNA. At higher concentrations, ozone destroys the capsid, or exterior protein shell by oxidation so DNA (deoxyribonucleic acid) or RNA (ribonucleic acid) structures of the microorganism are affected. In fact, DNA and RNA breakdown products could be identified in this case.

-- There is a two-step process of inactivation or viruses. Period one lasts less than 10 seconds, during which time a kill rate of about 99% is achieved. Period two runs for several minutes to complete destruction. This phenomenon is independent of changes in ozone concentration between 0.07 and 2.5 mg/l.