WHO changed their guidance yesterday - Friday 5 June .
"What's new:
In areas with widespread transmission, the WHO advises medical masks for all people working in clinical areas of a health facility, not only workers dealing with patients with COVID-19. In other words, said the Director General, when doctors are doing a ward round on the cardiology or palliative care units where there are no confirmed COVID-19 patients, they should still wear a medical mask.
In areas with community transmission, the WHO now advises that members of the general public aged 60 and older and those with underlying conditions should wear a medical mask in situations where physical distancing is not possible.
The general public should wear non-medical masks where there is widespread transmission and when physical distancing is difficult, such as on public transport, in shops or in other confined or crowded environments.
Additionally, the WHO has released new guidance on cloth masks, recommending that they consist of at least three layers of different materials: an inner layer being an absorbent material like cotton, a middle layer of non-woven materials such as polypropylene (for the filter) and an outer layer, which is a non absorbent material such as a polyester or a polyester blend."