The WHO has previously said the virus spreads primarily through small droplets expelled from the nose and mouth of an infected person that quickly sink to the ground.
The WHO responded to greater pressure from scientists and the media that covered their coronavirus aerial transmission asserts without really doing anything to alter its own guidelines for combating the pandemic.
Maria Van Kerkove explained that numerous signatories of the letter are engineers, "which adds to growing knowledge about the importance of ventilation, which we feel is very important". The scientists further said they planned to publish their letter in a scientific journal next week.
The World Health Organisation is exploring the risk of both airborne transmission and aerosol transmission as one of the modes of spread of COVID-19. "All of us must look in the mirror".
Kerkhove explained that experts have been studying the various potential modes of coronavirus transmission, including by airborne or aerosol droplets, "also other channels such as from mother-to-child, and from animals to humans".
Maria Van Kerkove clarified that numerous signatories of the letter are all engineers,"which adds to developing knowledge about the significance of venting, which we believe is quite important".
"Through you the world will understand the truth of what happened and also the solutions to build our future better as one humanity", WHO chief Tedros Adhanom Ghebreyesus said at the United Nations agency's headquarters in Geneva.
"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", the World Health Organization said.
"It is understood that there is not as yet universal acceptance of airborne transmission of the coronavirus; but in our collective assessment there is more than enough supporting evidence so that the precautionary principle should apply", they wrote.