For several months, it has become clear that wearing a mask will reduce the spread of Covid-19 because it prevents the spread of respiratory droplets and possible infection of other people. Now, the Centers for Disease Control has emphasized another benefit of wearing masks, which many people hope or suspect: The US Centers for Disease Control and Prevention wrote in a scientific briefing published on Tuesday that masks can also protect mouth wearers. Other people’s droplets hurt.
In an interview with Andrea Mitchell, who was interviewed by MSNBC on Tuesday, Dr. Anthony Fauci said that wearing a mask is a “two-way road.”
Facts have shown that a mask made of multiple layers of cloth can prevent 50-70% of a person’s breath droplets from spreading to others (this is a virus that infects others when an infectious person sneezes, coughs, breathes or speaks) One of the main ways).
On the other hand, according to the CDC, wearing a cloth mask can also reduce your personal exposure to infectious droplets, because the fabric barrier can filter out a certain degree of particles. Some data show that a multi-layer cloth mask made of high-thread fabric can filter out nearly 50% of respiratory droplets and atomized particles. (The N-95 respirator used by medical professionals can filter out 95% of very small particles)
Ideally, if everyone (whether infected or not) wears a mask, the effect will be higher.
More research needs to be done to determine which material and which type of combination can improve the filtering effect of the mask. (A Duke University study showed that surgical masks made of plastic called polypropylene are the most effective at filtering particles, followed by masks made of two layers of cotton and one layer of synthetic material.) The CDC currently advises people Choose a mask made of two layers of breathable, washable and tightly woven fabric.
Epidemiological studies have shown that when everyone wears a mask, the risk of transmission decreases. For example, a Beijing study of 124 households showed that at least one confirmed Covid-19 case was found. When the infected person and other members of the family wear masks, the transmission rate is reduced by 79%.
The CDC says that a “universal mask policy”, a combination of social distancing, ventilation, and hand hygiene can prevent future blockades.
Research conducted by Goldman Sachs in June found that a national mask directive that increased the rate of mask wear by 15% could prevent lock-in, which would reduce GDP by nearly 5%, or $1 trillion.
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