Quote:
Originally Posted by Bishop2b5
Masks probably do more to prevent someone who has the virus from spreading it to others than it does stopping the wearer from getting the virus, though it helps with that too. It doesn't completely stop the spread of Covid-19, but it does significantly reduce it.
I beg to differ. There Is no science behind wearing a mask. There Is science behind lack of oxygen, and you're own airway being obstructed.
For Example.: Summertime and It's HOTTTT and Humid, you got your mask on but since your sweating more and breathing harder you touch your face more ... We are being told we are idiots by people making money off of us.... This thought of masks Is a joke. JMHO
Additionally, n95 masks (vs homemade or surgical masks) filter out very small particles (down to 0.3 microns in diameter) like airborne microorganisms that float in the air. COVID as well as tuberculosis, measles, chickenpox, disseminated herpes zoster have such small diameters that necessitate use of these types of masks and other precautions to prevent the wearer from being infected.
We are learning that COVID may even require greater precautions. The standard rule of spatial separation in airborne precautions is 6 feet. Of 10 studies on horizontal droplet distance of COVID, 8 showed droplets travel more than 6 feet, in some cases up to 26 feet. Available studies also show that SARS-CoV-2 can be detected in the air, and remain viable 3 hours after aerosolization which happens with coughing, sneezing, etc.
Because of this airborne transmission of small particle respiratory pathogens, control of airflow is very important.
You don't want someone with this virus on a subway and, if not overwhelmed in a pandemic, in a hospital they would be placed in a negative pressure room in a hospital that prevent particles in the air from leaving that room.
Lots of medical and surgical procedures that can generate aerosolized particles. In most cases, these airborne particles are generated during manipulation of the large airways as in manual ventilation with a bag and mask, intubation, open endotracheal suctioning, bronchoscopy, CPR, collecting sputum samples. nebulizer therapy, non-invasive positive pressure ventilation (BIPAP, CPAP).
That's the science behind masks, transmission of respiratory infections and precautions.