From the Document: "Confusion continues to abound over the effectiveness of masks to protect people from COVID-19, and recent news stories touting imperfect studies are only compounding the situation. [...] In part 1 of this commentary we will cut through the murk by:  Explaining the differences between cloth face coverings (or cloth masks), surgical masks, and respirators in the context of infectious aerosol inhalation.  Delving into the science of respiratory protection.  Discussing the role of masks and respirators in the hierarchy of controls for disease prevention."
Center for Infectious Disease Research & Policy
Center for Infectious Disease Research & Policy: https://www.cidrap.umn.edu/