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The cilia help the tracheal cells push out tiny particles that find their way into air passages of the lung.

Cotton swabs are apparently used to create air passages during the procedure, with strips of paper applied to protect eyebrows and eyelashes.

But other clips show fully covered faces, with cotton swabs used to create air passages.

And so the air passage went without a hitch.

When people with Covid-19 develop a cough and fever, Wilson says this is a result of the infection reaching the respiratory tree – the air passages that conduct air between the lungs and the outside.