What is the most appropriate respiratory protection against COVID-19?

The world is suffering from a pandemic of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2 or COVID-19), with a mortality rate of up to 4%.1 COVID-19 infection is seen at disproportionately high levels among healthcare workers. Current UK guidance regarding the use of personal protective equipment (PPE) for COVID-19 was updated in April 2020.2 For close contact (<2 metres), the recommended respiratory protection remains a...