Coronavirus can spread in the air, updated CDC guidance acknowledges

“Aerial viruses, including COVID-19, are one of the most contagious and easy to spread,” the site now states.

Previously, on the CDC page, Covid-19 was thought to spread primarily between people in close contact (about 6 feet) and “occurs when an infected person coughs, sneezes, or talks. Through the breathing droplets. ”

“These particles can cause infections when inhaled into the nose, mouth, respiratory tract, and lungs,” he said. “This is believed to be the main way the virus spreads.”

“There is increasing evidence that droplets and particles in the air can remain floating in the air and be inhaled by others or travel more than 6 feet (during chorus practice, restaurants, etc.) Fitness class, etc.). ” “Generally, this risk increases in poorly ventilated indoor environments.”

The CDC has also added new measures to the information to protect itself and others.

Previously, the CDC maintained a “good social distance” of about 6 feet, washed hands, routinely cleaned and disinfected the surface, and covered the mouth and nose with a mask when around others. Proposed.

Currently, it says “at least 6 feet away from others as much as possible” and continues to instruct people to wear masks and regularly clean and disinfect. But now people are at home and isolated when they are sick, saying that “air purifiers should help reduce bacteria in the air in the room.”

Musk points out that it should not replace other precautions.

The update also changes the wording about asymptomatic infections, from “some asymptomatic people may be infected with the virus” to “people who are infected but have no symptoms. It can infect other people. “

Scientists demanded approval for aerial transmission

For several months, scientists have noted the potential for coronavirus transmission through viral particles in the air and urged health agencies to acknowledge it.

In April, a letter written to the White House by a prestigious scientific committee showed that the coronavirus can be transmitted not only by sneezing and coughing, but also by speaking and breathing.

“Current [coronavirus] Specific studies are limited, and the results of available studies are consistent with viral aerosolization from normal breathing, “said Harvard University School of Public Health, former Dean and NAS Standing Committee member. According to a letter written by Dean Dr. Harvey Feinberg, about emerging infectious diseases and the threat to health in the 21st century.

“Currently available studies [coronavirus] It can diffuse through the bioaerosol that is directly generated by the patient’s exhaled breath. “

And in July 239 Scientist wrote a letter As a result, the World Health Organization and other public health organizations have been called upon to get closer to the possibility of people catching the virus from airborne droplets.

“Current guidance from numerous international and national organizations focuses on hand washing, maintaining social distance, and precautions against splashes,” scientists wrote in a letter published in Clinical Infectious Diseases. wrote.

“Most public health organizations, including the World Health Organization, are unaware of airborne transmission, except for aerosol generation procedures performed in the medical setting. Hand washing and social distance are appropriate, but from respiratory organs carrying the virus. Insufficient to provide protection for the virus. Microdroplets released into the air by infected people, “they added.

After the letter is issued WHO publishes report It details how the coronavirus is transmitted from person to person, including in the air during certain medical procedures and in crowded indoor spaces.

On Sunday, Donald Milton, a professor of environmental health at the University of Maryland, who is studying how the virus is transmitted, one of the first authors of the letter, said the CDC’s new language is “a big improvement.” Said.

“It’s highly recommended that the CDC pay attention and make sure it’s working with science. Evidence is accumulating,” Milton wrote in an email to CNN.

He explained Preprinted paper released in August -Scientists explained culturing live viruses from the air in hospitals-“A significant addition to reports of outbreaks revealed to be the result of transmission by aerosols traveling more than 6 feet. ”

“It’s time for WHO to recognize these scientific advances,” Milton said.

CNN’s Maggie Fox, Elizabeth Cohen, Jacqueline Howard, and Jamie Gambrecht contributed to this report.

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