WHO Supports 'Emerging Evidence' Of Airborne Transmission Of Covid-19


 
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By Shelby Lin Erdman

The World Health Organization confirmed there is "emerging evidence" of airborne transmission of the coronavirus following the publication of a letter Monday signed by 239 scientists that urged the agency to be more forthcoming about the likelihood that people can catch the virus from droplets floating in the air.

Dr. Benedetta Alleganzi, WHO Technical Lead for Infection Prevention and Control, said during a briefing Tuesday, that the agency has discussed and collaborated with many of the scientists who signed the letter.

"We acknowledge that there is emerging evidence in this field, as in all other fields regarding the Covid-19 virus and pandemic and therefore we believe that we have to be open to this evidence and understand its implications regarding the modes of transmission and also regarding the precautions that need to be taken," Alleganzi said.

Infectious disease epidemiologist Maria Van Kerkove, with WHO's Health Emergencies Program, said many of the letter's signatories are engineers, "which adds to growing knowledge about the importance of ventilation, which we feel is very important."

"We have been talking about the possibility of airborne transmission and aerosol transmission as one of the modes of transmission of Covid-19, as well as droplet. We've looked at fomites. We've looked at fecal oral. We've looked at mother to child. We've looked at animal to human, of course as well," Van Kerkove said.

She said the agency is working on a scientific brief summarizing the current knowledge around transmission of the deadly virus, which should be available in the coming weeks.

Alleganzi emphasized more research is still needed on Covid-19 transmission.

"So, these are fields of research that are really growing and for which there is some evidence emerging but is not definitive," she said.

"And therefore, the possibility of airborne transmission in public settings, especially in very specific conditions crowded, closed, poorly ventilated settings that have been described cannot be ruled out. However, the evidence needs to be gathered and interpreted."



 
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