In these outbreaks, aerosol transmission, particularly in these indoor locations where there are crowded and inadequately ventilated spaces where infected persons spend long periods of time with others, can not be ruled out.
"We have been talking about the possibility of airborne transmission and aerosol transmission as one of the modes of transmission of COVID-19", World Health Organization technical lead for COVID-19 Maria Van Kerkhove told a news briefing.
However, the likelihood of airborne transmission in "crowded, closed, poorly ventilated settings" could not be ruled out.
The WHO hinted at its evolving opinion during a press briefing on Tuesday, when Maria Van Kerkhove, the agency's technical lead for COVID-19, said its scientists had been "talking about the possibility of airborne transmission and aerosol transmission".
The difference between the droplets and airborne disease is that tiny particles from a sneeze, cough or breath can linger in the air.
According to the group, measures that should be taken include providing sufficient ventilation, to minimise recirculating air, and avoiding overcrowding, particularly on public transport.
The authors cited previous studies suggesting that germs closely related to the new virus were spread via airborne transmission.
"There's evidence in what's happening that this virus doesn't act as a virus that would be airborne", Heymann said. The WHO last updated its coronavirus advice for the public on June 4th, and the materials do not detail the possibility of contracting COVID-19 from the air.
She said when we speak, shout, sing or even breathe, there are a lot of droplets that come out of our mouth, and these droplets are of different sizes. "My hope is that the defining crisis of our age will likewise remind all people that the best way forward - the only way forward - is together.If our panel can reinforce the need for multilateralism, we will have done our job".
The newspaper should be published in the coming weeks, per CNN.
However, Lee notes that long-range airborne transmission, as happens with diseases like measles, is very rare.
"What we have seen in the month of June is an acceleration in the number of cases and what has not accelerated with that is the number of deaths "But we know that it takes time and there is a lag phase".