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The Centers for Disease Control and Prevention has updated its website to warn that the coronavirus can spread through the air, something public health experts have been warning about for months but went unacknowledged by the agency until Monday.

The CDC says people can be exposed to the virus in small droplets and particles that can linger in the air for minutes to hours, potentially infecting people who are farther than 6 feet away and even people who come into the area after an infected person has left.

“There is evidence that under certain conditions, people with COVID-19 seem to have infected others who were more than 6 feet away,” the CDC says on its website.

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The CDC’s previous guidance said the virus spreads primarily among people who are in close contact with one another – within about 6 feet – through respiratory droplets produced when an infected person coughs, sneezes or talks. The current guidance says that’s still the greatest risk.

Scientists have warned for months that the virus could be spread through tiny aerosols that spread farther and hang in the air longer than previously known. The World Health Organization, lobbied by hundreds of scientists, noted that risk in July.

In September, the CDC attempted to address airborne transmission, revising its guidelines to say, “There is growing evidence that droplets and airborne particles can remain suspended and be breathed in by others, and travel distances beyond 6 feet (for example, during choir practice, in restaurants, or in fitness classes).”

However, a few days later the language on the CDC’s website was switched back to the previous information, without mention of airborne transmission. A note was added to say the agency was still working on its recommendations regarding the airborne transmission of SARS-CoV-2, the virus that causes COVID-19.

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a man and a woman taking a selfie: Over the past week, the Centers for Disease Control and Prevention (CDC) has made multiple significant adjustments to their guidance around COVID. On Sept. 18, the CDC reversed their guidelines on testing, once again noting that  asymptomatic people should be tested if they come into contact with a positive COVID case. On the same day, the CDC quietly changed its guidance on how COVID spreads and it's one of the most significant adjustments yet. The CDC is now acknowledging that COVID can spread through the air."COVID-19 most commonly spreads through respiratory droplets or small particles, such as those in aerosols, produced [from] an infected person," the CDC website now reads. For months, health experts have urged the CDC to acknowledge the mounting evidence that suggests COVID could be transmitted through aerosols, meaning tiny particles in the air. Until this most recent update, however, the CDC has largely ignored the possibility that COVID could be airborne in its formal guidelines."There is growing evidence that droplets and airborne particles can remain suspended in the air and be breathed in by others, and travel distances beyond six feet (for example, during choir practice, in restaurants, or in fitness classes)," the CDC's site now reads.The agency also warns of the potential dangers of poor ventilation: "In general, indoor environments without good ventilation increase this risk."The CDC page previously said that COVID was thought to spread mainly between people in close contact—within six feet—"through respiratory droplets produced when an infected person coughs, sneezes or talks." And while that's true, the page has been altered to now include two other ways the virus can spread through droplets, whether large or aerosolized.These are the five ways COVID spreads, according to the CDC's updated guidance. And for more behavior to avoid, check out 24 Things You're Doing Every Day That Put You at COVID Risk.

The CDC has not responded to USA TODAY’s request for comment on the latest revision.

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Is 6 feet enough?: CDC walks back its walkback on airborne transmission of COVID-19

More: CDC now recommends all people exposed to COVID-19 get tested, reversing earlier controversial guidance

The CDC’s update on airborne transmission follows a string of confusing changes to its guidelines on testing of people who don’t show symptoms of COVID-19.

The agency once said testing was recommended “for all close contacts of persons with SARS-CoV-2 infection.” In August, that was updated to say people do not “necessarily need a test” if they don’t show symptoms, even if they’ve been in close contact with an individual with a confirmed or suspected case of COVID-19.

a sign in front of a tall building in a city: In this file photo taken on April 24, 2020, shows the Centers for Disease Control (CDC) headquarters in Atlanta, Georgia. © TAMI CHAPPELL, AFP via Getty Images In this file photo taken on April 24, 2020, shows the Centers for Disease Control (CDC) headquarters in Atlanta, Georgia.

That change spurred widespread criticism because people often don’t develop symptoms for a couple of days, but they can still transmit the disease to others during that time.

In September the CDC changed course again, saying if you’ve been in close contact with an infected person and don’t have symptoms, “you need a test.”

“Inconsistent messaging is always a drawback in public health interventions, including in our response to COVID-19,” Ogbonnaya Omenka, an assistant professor who specializes in public health at Butler University’s College of Pharmacy and Health Sciences, told USA TODAY. “It can breed suspicion and distrust from the public.”

Follow Adrianna Rodriguez on Twitter: @AdriannaUSAT. 

Health and patient safety coverage at USA TODAY is made possible in part by a grant from the Masimo Foundation for Ethics, Innovation and Competition in Healthcare. The Masimo Foundation does not provide editorial input.

This article originally appeared on USA TODAY: CDC updates guidelines (again) to note risk of airborne transmission, says coronavirus can infect people more than 6 feet away

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