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Though even makeshift masks, or scarves will minimise potential aerosol infection of others if you're symptomatic or not.
Well, there's a big 'maybe' on this. Nobody really knows. Grasping my £10 rock (fnar) or donning Dan's tinfoil hat might be equally (in)effective.
The bigger problem is that people will not do this, they will buy up N95s that others should be using.
Howard
skydancer
Chalfie
Though even makeshift masks, or scarves will minimise potential aerosol infection of others if you're symptomatic or not.
We all need to assume we're infected which is the only way to protect everyone.
It's a unique situation where we protect others who protect us.