They sprayed filters and masks with silver/silica clusters. And guess what? It worked. Did you doubt that we would be right?
CV 19, silver/silica matrix tested against SARS COV2. https://www.sciencedirect.com/science/article/pii/S2666539520300067 They sprayed masks and air filters with it! Hmmm! Who told you to do that 3 months ago? World's best silver product. www.kimbertouch.com