Which masks and how much do they protect us from the corona virus?

What are the scientific studies that show that masks work, which masks protect us best, and how to use them correctly? explains family medicine doctor Prim. Mr. sci. dr. med. Melida Hasanagić. You can follow the series on the YouTube channel "60 Seconds About Corona," as well as on the Facebook page @BHAAAS and Instagram @bhaaas_usa_bih. The series is supported by the Government of Switzerland. The content of the publication, as well as the findings presented in it, do not necessarily reflect the views of the Government of Switzerland. 

https://www.youtube.com/watch?v=VSvNppesBik