WHO Director-General Tedros Adhanom Ghebreyesus Image- Reuters
The World Health Organization (WHO) shared new guidance regarding mask wearing at coronavirus briefing for health workers and the general public based on a review of evolving evidence.
WHO officials stressed that the new advice is an update to previous guidance, and that masks should only ever be used as part of an overall comprehensive strategy.
"The cornerstone of the response in every country must be to find, isolate, test and care for every case and to trace and quarantine every contact", said Dr Tedros Adhanom Ghebreyesus, WHO Director-General.
Here's what has changed and what hasn't:
What's hasn't changed:
To develop the guidance, the agency consulted with a range of international experts from different countries and disciplines such as infectious diseases and epidemiology. Their review of a variety of evidence demonstrated some new findings, including that face protections, including respirators or medical masks, can result in a large reduction of transmission of coronaviruses, including COVID-19.
Recommendations, such as those regarding fabric masks, are the result of new research that the WHO commissioned that was not available a month ago. This new evidence, said Dr Maria Van Kerkhove, WHO Technical Lead, has shown that the recommended fabric combination "can actually provide a mechanistic barrier that if someone were infected with COVID-19, you can prevent those droplets from going through and infecting someone."
Officials acknowledged that in some countries with dense populations it is difficult, if not impossible, to maintain social distancing, making masks "very important," stressed Soumya Swaminathan, WHO Chief Scientist, and meaning that offices, transport agencies and schools will need to examine their recommendations closely as countries lift lockdown restrictions. "Every organization, industry and sector needs to think about what are the measures that need to be put in place," said Swaminathan.
Throughout the COVID-19 crisis, mask guidance has varied by country, expert and organization. Some countries have recommended non-medical masks only for sick people, while other experts have advocated for non-medical mask use by healthy members of the general public when outside of their homes. Some countries, such as the Czech Republic and Slovakia, even made mask wearing mandatory.
The WHO had previously recommended against the wearing of medical masks by the general public given the global PPE shortage. It had been reluctant to advocate for wider usage of non-medical masks by healthy people given the lack of data available at the time.
Today, WHO officials reminded the public that masks still must be worn correctly, cared for and kept clean to ensure that they are effective. "People can infect themselves if they use contaminated hands to adjust a mask or repeatedly take it on or off," explained the Director-General.
"I cannot say this clearly enough," said the Director-General. "Masks alone will not protect you from COVID-19."