WHO underplaying risk of airborne spread of Covid-19, say scientists

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The potential for Covid-19 to spread through airborne transmission by lingering in the air is being underplayed by the World Health Organization, a group of scientists have said.

In an open letter due to be published this week, 239 scientists from 32 countries call for greater acknowledgement of the role of airborne spread of Covid-19 and the need for governments to implement control measures.

WHO guidance states that the virus is transmitted primarily between people through respiratory droplets and contact. Aerosol transmission involves much smaller particles that can remain in the air for long periods of time and can be transmitted to others over distances greater than one metre.

Members of the WHO’s infection prevention committee have said that while aerosol transmission may play some role, there is overwhelming evidence that the primary routes of transmission are through direct contact and respiratory droplets expelled during coughing, sneezing or speech. They said introducing new measures to guard against aerosol transmission was unfeasible and unlikely to make much difference to the spread of infection.

 
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