The latest update shows that wearing a face mask can not only protect the people around, but also protect the wearer from incoming virus projectiles.
Initially, the Centers for Disease Control and Prevention (CDC) advocated the use of masks to reduce radiation from asymptomatic or pre-symptomatic people who carry the virus. These wearers feel good and may not be aware of their infectivity to others.
Now, the CDC has added it to the guide, saying that masks can also reduce the wearer’s inhalation of these droplets.
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The CDC recommends that individuals wear non-valve multi-layer cloth masks.
Studies have shown that masks can block up to 50-70% of fine droplets and particles, and limit the forward diffusion of untrapped particles. In human experiments, an obstruction rate of 80% has been reached. The experiment has measured the obstruction of all breathing droplets. In some studies, cloth masks are equivalent to surgical masks and can be used as a source control barrier.
Studies have shown that, compared with a single-layer cloth with a lower thread count, a multilayer cloth with a higher thread count has better performance. In some cases, the filter will filter out nearly 50% of fine particles.
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The US Centers for Disease Control and Prevention says that some materials are better than others. For example, certain materials (such as polypropylene) can enhance the filtering effect, while other materials (such as silk) can help repel wet drops and reduce the moisture of the fabric, thereby maintaining breathability and comfort.
Among the many “real-world” examples highlighted in this version, one investigated a high-exposure event in detail, in which two symptomatic hairstylists interacted with 139 clients.
The US Centers for Disease Control and Prevention said that they interacted with each customer for an average of 15 minutes over a period of eight days. They found that none of the 67 customers who agreed to be interviewed and tested were infected.
So, what is preventing the spread? According to local laws and company policies at the time, hairdressers and all customers generally wear masks in salons.
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