COVID-19
Study: Asymptomatic COVID-19 Carriers do not Infect Others
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7219423
Mask Facts
Note: A COVID-19 (SARS-CoV-2) particle is 0.125 micrometers (μm); influenza virus size is 0.08 – 0.12 μm; a human hair is about 150 μm. *1 […]