The CDC guidance comes weeks after the agency published – and then took down – a similar warning, sparking debate over how the virus spreads.
In Monday's guidance, CDC said there was evidence that people with COVID-19 possibly infected others who were more than 6 feet away, within enclosed spaces with poor ventilation.
Under such circumstances, CDC said scientists believe the amount of infectious smaller droplet and particles, or aerosols, produced by the people with COVID-19 become concentrated enough to spread the virus.
Since individuals with COVID-19 release thousands of virus-laden aerosols and far fewer droplets while breathing and talking, the scientists said the focus must be on protecting against airborne transmission.
They also said that public health officials should clearly differentiate between droplets ejected by coughing or sneezing and aerosols that can carry the virus to greater distances
Public health officials must highlight the importance of moving activities outdoors and improving indoor air, along with wearing mask and social distancing, the letter said.
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