According to the manufacturer, all filters (including the standard Breeze filter) have a HEPA filter layer. This means that virus particles/aerosols and bacteria are filtered out. There is a special filter - currently not available - which has special coatings on the filter material in addition to the HEPA filter. According to the manufacturer, this filter is particularly efficient for viruses. But it has not been available for weeks/months.
I am also a little irritated. The description only says pre-filter. As a rule, prefilters are coarse filters and do not filter viruses and bacteria. I am satisfied with my Blueair: https://www.galaxus.ch/de... The filter for bacteria and viruses is in the description.