Coughs and sneezes spread diseases: but do ‘aerosol generating’ procedures?

The COVID-19 pandemic has led to the widespread use of continuous positive airway pressure (CPAP) and high flow nasal oxygen systems (HFNO) for respiratory support, with the former recently shown to reduce the requirement for intubation and mechanical ventilation, easing pressure on intensive care and improving outcomes.1 One major concern remains the theoretical risk for aerosolisation of SARS-CoV-2, with both CPAP and HFNO currently...