Experts at the World Health Organization (WHO) outlined the reasoning for updated guidance from the organization on Friday that everyone wear a fabric or non-medical mask in public areas where there is a risk of transmission, which Dr. Maria Van Kherkove said should contain three layers, including an absorbent inner layer, a filter and a non-absorbent outer layer.
In the new guidance prompted by evidence from studies conducted in recent weeks, WHO officials stressed that cloth face coverings are only one in a number of tools available to help limit the spread of the virus.
The WHO had previously stated that there was not enough evidence for or against the use of face coverings by healthy people in the wider community.
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