Sheldon
Veteran Member
Perhaps it would then also be nice, if they could prove the masks really work and are useful.
"The preponderance of evidence indicates that mask wearing reduces transmissibility per contact by reducing transmission of infected respiratory particles in both laboratory and clinical contexts."
"Still Confused About Masks? Here’s the Science Behind How Face Masks Prevent Coronavirus...health experts say the evidence is clear that masks can help prevent the spread of COVID-19 and that the more people wearing masks, the better."
"Multi-layer cloth masks block release of exhaled respiratory particles into the environment,3-6 along with any microorganisms associated with these particles.7, 8 Cloth masks not only effectively block most large droplets (i.e., 20-30 microns and larger),9 but they can also block the exhalation of fine droplets and particles (also often referred to as aerosols) smaller than 10 microns3, 5 which increase in number with the volume of speech10-12 and specific types of phonation.13 Multi-layer cloth masks can both block 50-70% of these fine droplets and particles3, 14 and limit the forward spread of those that are not captured.5, 6, 15, 16 Upwards of 80% blockage has been achieved in human experiments,4 with cloth masks in some studies performing on par with surgical masks as barriers for source control.3, 9, 14, 17 In one study, conducted prior to widespread circulation of the Delta variant, masks worked equally well for blocking aerosolized particles containing both “wild-type” virus and the Alpha variant (a more infectious variant).17"
"Community mask wearing substantially reduces transmission of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) in 2 ways. First, masks prevent infected persons from exposing others to SARS-CoV-2 by blocking exhalation of virus-containing droplets into the air (termed source control). This aspect of mask wearing is especially important because it is estimated that at least 50% or more of transmissions are from persons who never develop symptoms or those who are in the presymptomatic phase of COVID-19 illness.1 In recent laboratory experiments, multilayer cloth masks were more effective than single-layer masks, blocking as much as 50% to 70% of exhaled small droplets and particles.2,3 In some cases, cloth masks have performed similar to surgical or procedure masks for source control. Second, masks protect uninfected wearers. Masks form a barrier to large respiratory droplets that could land on exposed mucous membranes of the eye, nose, and mouth. Masks can also partially filter out small droplets and particles from inhaled air. Multiple layers of fabric and fabrics with higher thread counts improve filtration. However, the observed effectiveness of cloth masks to protect the wearer is lower than their effectiveness for source control,3 and the filtration capacity of cloth masks can be highly dependent on design, fit, and materials used. Standards for cloth masks are needed to help consumers select marketed products."