US health officials are adopting new methods to encourage Americans to wear masks: They emphasized recent research that masks can protect people wearing masks.
Previously, the Centers for Disease Control and Prevention recommended that people wear masks because there is evidence that masks can stop people infected with the coronavirus (whether they know it or not) and prevent it from spreading to others.
However, the Centers for Disease Control and Prevention released a new scientific brief this week, discussing the results of recent research, and found that the wearer can get some protection.
The agency’s guidance has not changed. It continues to recommend that Americans wear masks to stop the spread of the virus.
Dr. John Brooks, the chief medical officer of CDC’s COVID-19 emergency response, said: “But now we say this is another reason.”
Agency officials were influenced by a new study led by Japanese researchers. Japanese researchers used human model heads and artificial respirators to simulate the spread of coronavirus particles in the air and evaluated the barrier effect of masks.
It confirms earlier research that masks work best when worn by an infected person, who may spread the mask by coughing, sneezing or talking. Studies have found that masks can prevent about 60% of the virus from spreading from the infected person.
But the researchers also found that when an uninfected person wearing a mask unfortunately falls near an infected person who is not wearing a mask, this is beneficial. In this case, the amount of virus inhaled by uninfected people is reduced by 37% to 50%.
When both people were wearing masks, the virus particles reaching the second person dropped the most, approaching 70%.
This research does not perfectly mimic most realities. For example, the head is closer than the six feet, and the exhaled model’s head does more of a continuous cough than regular breathing.
But Brooks said that several other real-world studies have shown the value of everyone wearing a mask, including a customer at a hair salon in Missouri, another customer on a US aircraft carrier, and other tracking infections at adoption sites. And dead customers. Cover up the task.
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