Let's say flu category like COVID-19 and the recent Flu A.
This is the common one priced abovee average. Does it work more effectively to reduce spreading or reduce infection?
Discussion
simple answer: no difference. the efficacy will be about similar to a medical grade 3-ply
most study only focus on 3 domain :
3-ply medical grade,
n95,
cloth masked.
all these in-between have no clear evidence
a 3-ply face mask is generally good for most time. drs have been using it even before covid. a n95 is only necessary in aerosolized situation (like a dentist doing scaling) while cloth mask is not effective