The update follows a An embarrassing incident last month When the agency removed a draft that did not go through a proper review and was posted incorrectly. The wording of the draft includes aerosols – small drops that can stay in the air, referring to potentially significant distance travel. Officials said the draft was removed because they feared the language could be misinterpreted as indicating that the main way the virus was spread was airborne transmission.
That is not the case. The CDC said the main drivers of viral transmission are large amounts of respiratory drops that come out when someone coughs, sneezes, sings, talks or breathes.
The updated web page states, “There is evidence that, under certain conditions, people with Covid-19 became infected more than six feet away.” “These transmissions take place in an enclosed space with an inadequate ventilation. Sometimes the infected person would breathe heavily, for example while singing or exercising. “
“Under these circumstances, scientists believe that the amount of infectious droplets and particles produced by people from Kovid-1 has become concentrated enough to spread the virus to others,” says the web page. People who became infected during the same period or only after the person with Covid-19 left.
In a statement issued shortly after the web page was updated, the agency said: “They currently believe, based on science, that people with Covid-1 get infected as long and as closely as possible.”
The CDC added: “Today’s update acknowledges the existence of some published reports showing limited, unusual circumstances where people with COVID-19 were infected who were more than 6 feet away or soon a COVID-19 positive person left a field.” The agency said the transmission “occurred in poorly ventilated and enclosed spaces, often involving activities that involve heavy breathing, such as singing or exercise. Such environments and activities can contribute to the formation of virus-carrying particles.”
The agency said its recommendations remain the same based on current science and after a “complete technical review of the guidelines”.
The CDC said people can protect themselves by staying at least six feet away from others, wearing masks that cover their noses and mouths, washing hands frequently, wiping often touched surfaces, and staying home when sick. Can stay. People should also avoid it Crowded indoor spaces And Make sure the indoor spaces are well ventilated Bringing in as much outdoor air as possible, the agency said.
Although many experts have already drawn attention to the evidence that airborne transmission plays a role in transmitting airborne viruses, the CDC’s official acknowledgment will increase public health concerns about the risks of infection from crowded indoor spaces with poorly ventilated.
Both the Presidential Campaign and the Debate Commission say they plan to move forward with President Trump’s personal programs in less than a week. The novel has tested positive for coronavirus. As more White House employees declare they have Positive test for coronavirus, It is not clear what protocols have been put in place to reduce the risk of infection for staff, many of whom do not wear masks and do not work in trouble.
When there is adequate ventilation, respiratory drops are either diluted by outdoor air or pushed through air exchange, according to experts. To improve indoor airflow in public buildings, experts from the Yale School of Public Health suggest turning sensor-based ventilation into more continuous flush air. Open the windows for a fresh breeze. Vers Lata ceiling fan blades, away from room professionals, can draw air.
Experts have drawn attention to the spread of the virus in singing, buses, fitness classes and poorly ventilated areas. In July, more than 200 aerosol biologists and other experts sent a letter to the World Health Organization expressing concern about airborne infections, which they responded with. “Emerging evidenceThe pathogen is spread in the air.
Group of infectious-disease physicians and aerosol specialists, in A letter published on Monday In the Science Journal, the CDC placed more emphasis on the airborne potential of this virus than its update.
The balance of attention should be shifted to protect against airborne transmission, they said, as people are more likely to inhale the floating virus than to be sprayed with rapidly falling drops of contaminated body fluids.
Aerosols and airborne transmissions are the only way to explain the super-spreader events we understand, the letter author said. Kimberly Stone, Atmospheric chemist at the University of California at San Diego, to the Washington Post. Once the ventilated route is adopted, she said, this becomes a “fixable” problem through proper ventilation.
Prather said, “Always wear a mask inside the house when other people are present. It’s important to differentiate – but, from the inside, there’s no such thing as a completely “safe social distance”.
Some explicit discussion surrounding airborne transmission may result from conditions used differently in the field of aerosol chemicals vs. anti-infectious diseases, not from the substance itself. The science paper explains that liquids blown up to 100 microns wide (the thickness of a sheet of paper), unlike some definitions centered on small particles, act as aerosols.
“Aerosol biologists speak a slightly different language than clinicians like me, where we are focusing more on the practical application of transmission for infection control,” said CDC Deputy Director Jay Butler. Infectious diseases, last month. He summed up a National Academy of Sciences Sciences workshop convened in late August on the growing evidence of climate change, as it “agreed more than disagreed” around the possibility.
There are many well-documented cases in which coronavirus spreads quickly and widely in closed or indoor environments – a restaurant in Guangzhou, China; A bus traveling in China’s Zhejiang province; A call center in Seoul and a church in Washington state. In that case, a singer spread the virus 45 feet away And more than 50 people have been infected.
Those reports prompted the CDC to update information on how the coronavirus is spread, officials said. “We were more concerned about the indoor environment,” said a CDC scientist who spoke on condition of anonymity because he was not authorized to speak on the record.
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