Infection prevention and control in the context of COVID-19: a guideline
Read 'Section 1.3' (pgs 15-18), 'Part 1: Health-care settings' (pgs 26-29), 'Mask use for source control' (pgs 38-50) and 'Section 3.3' (pgs 65-73).
Click https://iris.who.int/bitstream/handle/10665/375200/WHO-2019-nCoV-IPC-guideline-2023.4-eng.pdf?sequence=1 link to open resource.