A comprehensive review of cellulose-based air filters has shown that cellulose is an effective material to produce antiviral masks. Cellulose ester materials that are anionic are still seen as the most effective antiviral material in filters and again affirms the potential interaction of positively charged spike proteins and negative GAGs. However, LbL nanocoating of cellulose has both been described as a method to produce antiviral filters [161]. In an unrelated application, our research has shown that cellulose can be coated easily employing LbL coating with, for example, chitosan as coating materials [162]. It is proposed that it would be possible to modify a facial mask that is based on a cellulose fabric with antiviral GAGs.