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The coronavirus can stay aloft for hours in tiny droplets in stagnant air, infecting people as they inhale, mounting scientific evidence suggests.

This risk is highest in crowded indoor spaces with poor ventilation, and may help explain superspreading events reported in meatpacking plants, churches and restaurants.

It’s unclear how often the virus is spread via these tiny droplets, or aerosols, compared with larger droplets that are expelled when a sick person coughs or sneezes, or transmitted through contact with contaminated surfaces, said Linsey Marr, an aerosol expert at Virginia Tech.

Follow latest updates on the Covid-19 pandemic here

Aerosols are released even when a person without symptoms exhales, talks or sings, according to Marr and more than 200 other experts, who have outlined the evidence in an open letter to the World Health Organization.

What is clear, they said, is that people should consider minimizing time indoors with people outside their families. Schools, nursing homes and businesses should consider adding powerful new air filters and ultraviolet lights that can kill airborne viruses.

What does it mean for a virus to be airborne?

For a virus to be airborne means that it can be carried through the air in a viable form. For most pathogens, this is a yes-no scenario. HIV, too delicate to survive outside the body, is not airborne. Measles is airborne, and dangerously so: It can survive in the air for up to two hours.

For the coronavirus, the definition has been more complicated. Experts agree that the virus does not travel long distances or remain viable outdoors. But evidence suggests it can traverse the length of a room and, in one set of experimental conditions, remain viable for perhaps three hours.

How are aerosols different from droplets?

Aerosols are droplets, droplets are aerosols — they do not differ except in size. Scientists sometimes refer to droplets fewer than 5 microns in diameter as aerosols. (By comparison, a red blood cell is about 5 microns in diameter; a human hair is about 50 microns wide.)

From the start of the pandemic, the WHO and other public health organizations have focused on the virus’s ability to spread through large droplets that are expelled when a symptomatic person coughs or sneezes.

These droplets are heavy, relatively speaking, and fall quickly to the floor or onto a surface that others might touch. This is why public health agencies have recommended maintaining a distance of at least 6 feet from others, and frequent hand washing.

But some experts have said for months that infected people also are releasing aerosols when they cough and sneeze. More important, they expel aerosols even when they breathe, talk or sing, especially with some exertion.

Scientists know now that people can spread the virus even in the absence of symptoms — without coughing or sneezing — and aerosols might explain that phenomenon.

Because aerosols are smaller, they contain much less virus than droplets do. But because they are lighter, they can linger in the air for hours, especially in the absence of fresh air. In a crowded indoor space, a single infected person can release enough aerosolized virus over time to infect many people, perhaps seeding a superspreader event.

For droplets to be responsible for that kind of spread, a single person would have to be within a few feet of all the other people, or to have contaminated an object that everyone else touched. All that seems unlikely to many experts: “I have to do too many mental gymnastics to explain those other routes of transmission compared to aerosol transmission, which is much simpler,” Marr said.

Can I stop worrying about physical distancing and washing my hands?

Physical distancing is still very important. The closer you are to an infected person, the more aerosols and droplets you may be exposed to. Washing your hands often is still a good idea.

What’s new is that those two things may not be enough. “We should be placing as much emphasis on masks and ventilation as we do with hand washing,” Marr said. “As far as we can tell, this is equally important, if not more important.”

Should I begin wearing a hospital-grade mask indoors? And how long is too long to stay indoors?

Health care workers may all need to wear N95 masks, which filter out most aerosols. At the moment, they are advised to do so only when engaged in certain medical procedures that are thought to produce aerosols.

For the rest of us, cloth face masks will still greatly reduce risk, as long as most people wear them. At home, when you’re with your own family or with roommates you know to be careful, masks are still not necessary. But it is a good idea to wear them in other indoor spaces, experts said.

As for how long is safe, that is frustratingly tough to answer. A lot depends on whether the room is too crowded to allow for a safe distance from others and whether there is fresh air circulating through the room.

What does airborne transmission mean for reopening schools and colleges?

This is a matter of intense debate. Many schools are poorly ventilated and are too poorly funded to invest in new filtration systems. “There is a huge vulnerability to infection transmission via aerosols in schools,” said Don Milton, an aerosol expert at the University of Maryland.

Most children younger than 12 seem to have only mild symptoms, if any, so elementary schools may get by. “So far, we don’t have evidence that elementary schools will be a problem, but the upper grades, I think, would be more likely to be a problem,” Milton said.

College dorms and classrooms are also cause for concern.

Milton said the government should think of long-term solutions for these problems. Having public schools closed “clogs up the whole economy, and it’s a major vulnerability,” he said.

“Until we understand how this is part of our national defense, and fund it appropriately, we’re going to remain extremely vulnerable to these kinds of biological threats.”

What are some things I can do to minimize the risks?

Do as much as you can outdoors. Despite the many photos of people at beaches, even a somewhat crowded beach, especially on a breezy day, is likely to be safer than a pub or an indoor restaurant with recycled air.

But even outdoors, wear a mask if you are likely to be close to others for an extended period.

When indoors, one simple thing people can do is to “open their windows and doors whenever possible,” Marr said. You can also upgrade the filters in your home air-conditioning systems, or adjust the settings to use more outdoor air rather than recirculated air.

Public buildings and businesses may want to invest in air purifiers and ultraviolet lights that can kill the virus. Despite their reputation, elevators may not be a big risk, Milton said, compared with public bathrooms or offices with stagnant air where you may spend a long time.

If none of those things are possible, try to minimize the time you spend in an indoor space, especially without a mask. The longer you spend inside, the greater the dose of virus you might inhale.

Jeddah, May 3: Saudis and expats who spread rumors on social media could be jailed for up to five years and fined SR3 million ($800,000) under measures to counter false information regarding the coronavirus pandemic.

The move follows warnings by Saudi Arabia’s Ministry of Health, Ministry of Interior, General Presidency of the Two Holy Mosques and other government entities that people should rely on trusted news sources and not third parties for information on the Kingdom’s handling of the COVID-19 outbreak.

The Saudi Public Prosecutor warned that legal action will be taken against individuals who spread misinformation and rumors.

On Saturday, media spokesman for the Riyadh region police, Col. Shakir Al-Tuwaijri, highlighted a video circulating on social media in which a person spreads rumors about steps taken to curb the spread of the coronavirus.

Other false claims include a planned change in curfew hours, warnings of food shortages, and a suggestion that health authorities are deliberately concealing the number of cases in the Kingdom.

In a recent case, a Riyadh resident claimed to know when worshippers will be allowed to return to the Grand Mosque.

All suspects have been arrested and face legal action, police said.

Dimah Al-Sharif, a Saudi legal counsel and member of the International Association of Lawyers, urged people to be responsible regarding content they access on social media.

“Receivers should not save such content or share it with others, and should delete it if possible since they, too, will be liable,” she said.

“Under Saudi laws to counter cyber-crime, we are not allowed to produce, prepare, send or save any unauthorized content or rumors.”

Individuals who breach regulations can be jailed for up to five years and face fines of SR3 million, as well as confiscation of the device(s) used in the crime, she said.

In addition, the judicial ruling will be published in newspapers at the offender’s expense.

The Kingdom’s Public Prosecution Office took to social media to warn users about the consequences of spreading rumors and misinformation.

@bip_ksa tweeted: “Receiving information from its official sources is a moral obligation and commitment, and legal responsibility. Do not fall victim to malicious rumors and news from anonymous sources that violate the procedures and effort, and cause terror regarding the Coronavirus, in order to avoid strict criminal accountability in this regard.”

Washington, May 15: A top US senator has unveiled an 18-point plan, including enhancing military ties with India, to hold the Chinese government accountable for its "lies, deception, and cover-ups" that ultimately led to the global COVID-19 pandemic.

The prominent suggestions are moving manufacturing chain from China and deepening military-strategic ties with India, Vietnam and Taiwan.

"The Chinese government maliciously covered up and enabled a global pandemic that has caused misery for so many Americans. This is the same regime that locks up its own citizens in labour camps, steals America's technology and jobs, and threatens the sovereignty of our allies,” said Senator Thom Tillis, presenting his detailed, 18-point plan on Thursday.

"This is a major wake-up call to the United States and the rest of the free world. My plan of action will hold the Chinese government accountable for lying about COVID-19; sanctioning the Chinese government while protecting America's economy, public health, and national security," he said.

The plan seeking to create a Pacific Deterrence Initiative and immediately approve the military's request for USD 20 billion in funding. It also calls for deepening military ties with regional allies and expand equipment sales to India, Taiwan and Vietnam.

Encourage Japan to rebuild its military and offer Japan and South Korea sales of offensive military equipment, it said.

"Move manufacturing back to the US from China and gradually eliminate our supply chain dependency on China. Stop China from stealing our technology and provide incentives to American companies to regain our technological advantage. Strengthen cybersecurity against Chinese hacks and sabotage," the plan stated.

"Prevent American taxpayer money from being used by the Chinese government to pay off their debt. Implement the US ban on (Chinese technology company) Huawei and coordinate with our allies to implement similar bans,” it added.

The plan seeks restitution from the Chinese government and imposition of sanctions for lying about the virus. It further said China should be sanctioned for their atrocious human rights record.

Senator Tillis' plan urges the Trump Administration to formally request the International Olympic Committee to withdraw the 2022 Winter Olympics from Beijing.

"Stop China's propaganda campaign inside the United States. Treat Chinese government-run media outlets as the propaganda proxies that they are," the plan stated.

Urging the government to investigate the Chinese government's cover-up of the spread of COVID-19, the plan also seeks to investigate America's reliance on China's supply chains and threats to public safety and national security.

"Ensure the independence of the WHO through investigations and reform. Expose and counter China's predatory debt-trap diplomacy targeting developing countries. Increase intelligence sharing on potential pandemics and lead the creation of a watchdog organization to monitor foreign governments' handling of deadly viruses," Tillis said in his suggestions.

The coronavirus, which first emerged in China's Wuhan city in December last, has killed over 3,00,000 people with 4.3 million confirmed cases across the world. More than a quarter of all confirmed COVID-19 cases are from the US.

There has been increasing pressure on the President Trump, in the last several weeks, to take action against China as lawmakers and opinion-makers feel that the COVID-19 spread across the world from Wuhan because of Chinese inaction.

Meanwhile, Senator John Barrasso, in a speech on the Senate floor on Thursday, highlighted the need to update the Foreign Intelligence Surveillance Act (FISA) legislation that was put on hold by the coronavirus pandemic.

"The virus could have been contained had it not been for the Chinese Government's unscrupulous cover-up. China knew the risk months before the rest of the world; yet Chinese communist leaders destroyed key evidence, they under-reported the number of coronavirus cases, and they misled the world about its deadly, rapid spread," he said.

Asserting that the virus should have been contained in Wuhan, he said tens and tens of thousands of Americans and hundreds of thousands of people worldwide have died as a result of China's failure.

Barrasso said the US should encourage its companies to create American and western supply chains. "That way our frontline workers have what they need in the time of crisis," he said.

"Not again, not ever will we be exclusively sourced for critical drugs from China. We should diversify supply and bring home as much of our supply chain as possible," he added.

Congressman Troy Balderson introduced bicameral legislation with Congressman Doug Collins and Senator Lindsey Graham that will hold China accountable for deceptive actions taken by its leaders that led to the spread and subsequent global pandemic.

The COVID-19 Accountability Act authorises president Donald Trump to impose sanctions on China if it fails to cooperate with a full investigation led by the US or its allies into the events that lead to the COVID-19 outbreak.

"The number of Ohioan lives needlessly claimed by this pandemic could have been significantly reduced had China taken appropriate measures to control the virus' spread and disclose its severity," said Balderson.

"The United States can't look the other way when China so recklessly compromised worldwide health and the global economy. China and its Communist Party leadership must be held accountable," he said.