US health agency updates guidance on the novel coronavirus again.
US Centers for Disease Control and Prevention (CDC) on Monday updated its guidance saying COVID-19 can sometimes be spread by airborne transmission.
Aerosols lingering in the air could be a major source of Covid-19 transmission, a group of US scientists warned in an unrelated open letter published in medical journal Science on Monday.
The focus must be on protecting against airborne transmission because individuals with Covid-19 release thousands of virus-laden aerosols and far fewer droplets while breathing and talking, the scientists said.
Monday’s update acknowledges published reports that showed limited, uncommon circumstances where people with Covid-19 infected others who were more than 6 feet away or shortly after the Covid-19-positive person left an area, the agency said.
In these instances, the CDC said transmission occurred in poorly ventilated and enclosed spaces that often involved activities that caused heavier breathing, like singing or exercise.
Last month, the CDC published – and then took down – its guidance warning possible airborne transmission of the novel coronavirus.
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