Walking fast in corridors increases Covid infection risk

Picture a speeding boat leaving a wake in water as it moves. Similar to this, when a person walking in a corridor coughs, their breath expels droplets that form a trail in the air around them.

A study has revealed the existence of a “re-circulation bubble” directly behind the person’s torso and a long wake streaming out behind them at approximately waist height, with flow patterns strongly related to the shape of the human body.