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@luckytran

Yeah... up to a point.

But pre-covid there was also a WRONG dogma which was widely accepted by western public health professionals.

It was assumed that airborne transmission doesn't happen (instead it's all by contact, so "wash your hands"). Pre-covid, this was the mainstream view among westerm infectious disease specialists, but it's WRONG.

The error came from confusing two particle size thresholds: 5 µm to enter the lung directiy, and 100 µm to remain airborne.