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There is no specific research on how well face coverings work against new variants of the virus, including the more transmissible variant from the United Kingdom that has been detected in at least 22 states in the United States.
Dr. Anthony Fauci, director of the National Institute of Allergy and Infectious Diseases, said that when it comes to wearing two masks to protect against the coronavirus, it "makes common sense" that more than one layer of masking would be more effective.
The new variants "may lead people who have them to have a higher amount of virus in their nose, in their mouth, so that when they breathe or talk or cough or sing, they may put more viral particles out in the environment than the average person," she said.

I'd like to know the scientific view/studies done here ?.
https://www.nbcnews.com/health/health-news/what-do-coronavirus-variants-mean-your-masks-n1255518





