expert reaction to a study about facemask effectiveness

Some interesting science here

https://www.sciencemediacentre.org/expert-reaction-to-a-study-about-facemask-effectiveness/

study measured shedding of virus in aerosols from patients with or without facemasks over a period of 30 minutes.  Even without a facemask only 4 /10 coronavirus infected patients shed any virus and the levels of virus released were up to 1m times lower than in the nasal swabs.

study presents important information about coronavirus transmission but, more importantly, again highlights the critical need for physical distancing and hand washing as the most effective ways of reducing spread of the virus