Can KN95 filter cotton prevent bacteria?

KN95 filter cotton can prevent bacteria. The filtration efficiency of KN95 filter cotton exceeds 95%, particularly achieving over 95% efficiency for non-oily particles larger than 0.3 microns. Since the size of microorganisms such as bacteria and viruses is generally greater than 0.7 microns, KN95 filter cotton can effectively block these microorganisms outside the mask, preventing them from entering the respiratory system. This protective capability makes KN95 masks highly significant in preventing the spread of respiratory diseases. Although KN95 filter cotton is highly effective in blocking bacteria, it must be worn correctly and replaced timely to ensure its protective performance. Additionally, in special environments such as enclosed spaces or areas with high concentrations of harmful gases, additional protective measures may be necessary.