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- The WHO says the widespread use of face masks or coverings by the general public is still not yet supported by high quality or direct scientific evidence.
- But it says a growing amount of observational evidence from several countries that have ordered or recommended the wearing of masks, as well as the difficulty of social distancing in many settings, is enough for it to change its advice.
When should you wear a mask?
The WHO recommends the wearing of non-medical masks by:
- People living in cramped conditions, such as in refugee camps or slums.
Because of the risk of diverting critical resources from health workers, the WHO says medical masks should be reserved for healthcare professionals and people in at-risk groups. Everyone else should use what it terms non-medical or fabric masks. Here is some of its advice on mask choice:
- Choose materials that capture droplets but remain easy to breathe through.
- Avoid stretchy materials, because stretching may increase pore sizes, and preferably use a fabric that can be washed at 60C (140F) or higher.
- A minimum of three layers is needed, including an absorbent inner layer, touching the mouth, and a synthetic outer layer that does not easily absorb water.
- Wash frequently, at the highest temperature possible, and don't share.
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