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Viral filtration is a critical step in the purification of biologics and in the monitoring of microbiological water quality. Viral filters are also essential protection elements against airborne viral particles. The present review first focuses on cellulose based filter media currently used for size exclusion and/or adsorptive filtration of viruses from biopharmaceutical and environmental

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An N95 mask is designed to block at least 95% of particles 0.3 microns in size or larger. So even a properly fitted N95 mask does not completely eliminate the risk of illness or death. It works by tortuous path, removing particles by impact and absorption of the particulate into the filter by trapping particles between the fibers of the mask.

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