Nearly every day some new scientific evidence is published and one of the principal players in the US, the CDC, US Centers for Disease Control and Prevention, updated guidance on its website on Friday to say that coronavirus can commonly spread "through respiratory droplets or small particles, such as those in aerosols", which are produced even when a person breathes, warning that the principal form of propagation of the virus is through the air. The guidance also stated that these particles might travel further than six feet.
"CDC is now updating its recommendations regarding airborne transmission of SARS-CoV-2 (the virus that causes COVID-19)", reads a note on the altered page.
But by Monday afternoon, the CDC reversed its guidelines and removed the update from the page.
'Most public health organizations, including the World Health Organization, do not recognize airborne transmission except for aerosol-generating procedures performed in healthcare settings. However, it also now says people should stay home and isolate when sick, and 'use air purifiers to help reduce airborne germs in indoor spaces'.
Before this change, the CDC said if you were asymptomatic and in contact with someone who was COVID-19 positive, you did not necessarily need to get tested.
The updated draft passages and comments on smaller particles and ventilation appeared to embrace recent studies from the CDC. He is a 2011 Western Kentucky University graduate who has previously worked at the Paducah Sun and Madisonville Messenger as a sports reporter and the Lexington Herald-Leader as a breaking news reporter.
The page, updated Friday, still says Covid-19 most commonly spreads between people who are in close contact with one another, but now says the virus is known to spread "through respiratory droplets or small particles, such as those in aerosols, produced when an infected person coughs, sneezes, sings, talks or breathes".
Droplets carrying the coronavirus may be able to travel farther than 6 feet, and that makes it risky to spend time in indoor environments without good ventilation, the CDC said.
When the Centres for Disease Control and Prevention (CDC) updated its coronavirus guidance last week to say that Covid-19 spreads mainly through tiny droplets called aerosols - and not through the larger beads of spit and phlegm that enter the air from coughing and sneezing - outside health experts were relieved the organisation had finally come around to the general scientific consensus. It's not clear why the CDC finally followed; Jimenez said high-ranking CDC officials were still arguing publicly against airborne transmission as a major vector as recently as late August.
"The CDC has always been the most respected agency in the world for public health, but now it's been politically muzzled", he said.