I cannot say for sure as I'm not a medical researcher but according to this guy the previous 40 years of medical research shows that masks are ineffective against viral transmission. <a href='https://youtube.com/watch?v=sHA-a4moDKE'>https://youtube.com/watch?v=sHA-a4moDKE</a><div class='embed' data-url='https://youtube.com/watch?v=sHA-a4moDKE'></div>
I cannot say for sure as I'm not a medical researcher but according to this guy the previous 40 years of medical research shows that masks are ineffective against viral transmission. <a href='https://youtube.com/watch?v=sHA-a4moDKE'>https://youtube.com/watch?v=sHA-a4moDKE</a><div class='embed' data-url='https://youtube.com/watch?v=sHA-a4moDKE'></div>