How effective is the use of face shields and valve masks?

#Dos and don'ts:coronavirus

In a new visualization done by researchers, it shows that “Face shields” And “Masks with exhalation valve(with valve)“، They are not the best protection to prevent the spread of Covid-19!

According to research, the best way to prevent Outbreak of covid19, use of “Fabric masks” or “Surgical masks” with High quality is.

Hoping that the publication of these recommendations will help the health of those around us.