Vaccinations and masks are per personal requirement not mandatory.
Virus particles are between
60-140 ng with that said.
There are 1000 ng in 1 micron
So n95 mask is rated at
95% effective @ particles @330ng. ng=nanograms
=.3 microns
You do the math.
Ask the China's bio-wepons dept.
If it was an accident.
I'll wait for CCP answer.
NO IM NOT WONG.
Trained by US Navy
I'm sure you aren't.