For the questions on what kind of mask, etc., from that same recent WHO link:
Who should wear what kind of mask?
Medical masks are recommended for the following groups:
All health workers in clinical settings. See our guidance for more information on the use of personal protective equipment by health care workers.
Anyone who is feeling unwell, including people with mild symptoms, such as muscle aches, slight cough, sore throat or fatigue.
People caring for suspected or confirmed cases of COVID-19 outside of health facilities.
When they cannot guarantee a distance of at least 1 metre from others, medical masks are also recommended for the following groups, as they are at a higher risk of becoming seriously ill with COVID-19 and dying:
People aged 60 or over.
People of any age with underlying health conditions, including: chronic respiratory disease, cardiovascular disease, cancer, obesity, immunocompromised patients and diabetes mellitus.
Non-medical, fabric masks are advised for use by the general public when physical distancing cannot be maintained, as part of a comprehensive ‘Do it all!’ approach, including improving ventilation; cleaning hands; covering sneezes and coughs, and more.
Find out more on our main public advice page.
Further resources:
Read our Q&A on children and masks related to COVID-19 for more information on precautions for younger age groups.
Watch our animation on medical and fabric masks, explaining who wears what, when and where.