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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.

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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.

Dubai, Apr 26: The Central Bank of the UAE (CBUAE) has instructed financial institutions in the country to search and freeze all bank accounts of Indian billionaire BR Shetty and his family along with those of companies where he has a stake.

The apex bank has also blacklisted several firms associated with Shetty along with their entire senior management.

In an advisory issued last week, CBUAE cited decisions of the Federal Attorney General and asked financial institutions to search and freeze any bank accounts, deposits or investments in the name of Shetty or his family members.

Financial institutions have been directed to stop transfers from these accounts and deny access to deposit boxes.

Currently in India and facing a string of charges, Shetty is the founder of NMC Health.

The heathcare provider was placed into administration by a UK court recently following an application by the Abu Dhabi Commercial Bank (ADCB) which alone has an exposure of $981 million (Dh3.6 billion).

Overall, UAE banks have a combined exposure of more than Dh8bn to NMC which owes money to Oman-based banks and financial institutions as well.

Probing credit facilities
The Central Bank has sought information about credit facilites extended to the Shettys along with details of their safe deposit boxes and the financial transfers they have made till date.

A similar advisory has been issued for NMC Healthcare and NMC Holding, based on the decision of the Head of Plenary Fund Prosecution.

The Central Bank has also blacklisted several companies associated with Shetty. Key staff members of these firms have been similarly blacklisted.

New Delhi, Feb 4: Uttar Pradesh Chief Minister Yogi Adityanath on Monday accused Arvind Kejriwal of having a "partnership" with Pakistan and appealed to the people in Delhi to not vote for the AAP chief as it will make Pakistan happy.

Ramping up his attack on the Shaheen Bagh protest, Adityanath said that the protest against the Citizenship Amendment Act (CAA) is merely an excuse for people to vent their anger against the scrapping of Article 370.

"You must have seen their partnership on 370. Arvind Kejriwal used to speak in the same voice as Imran Khan on Article 370. You must have heard it.

"Now when elections are taking place in Delhi, who is speaking in favour of Arvind Kejriwal? It is the ministers of Pakistan. They are aware that Kejriwal is feeding 'biryani to protesters at Shaheen Bagh'," he said, referring to Pakistan minister Fawad Chaudhry's tweet asking Indians to defeat Prime Minister Narendra Modi.

Adityanath addressed three rallies on Monday in the national capital ahead of assembly elections.

"Will Pakistan decide who Indians should vote for. If voting for Kejriwal will make Pakistan happy, should it be done," he asked at a rally in Mehrauli.

Adityanath said his Delhi counterpart Kejriwal has become a "toy in the hands of anti-social and anti-India elements".

Addressing a rally in Vikaspuri in west Delhi, he said that Kejriwal is not bothered about key issues such as providing clean drinking water but is concerned about Shaheen Bagh, the anti-citizenship amendment act protest site.

At another rally in Uttam Nagar in west Delhi, Adityanath said Kejriwal has played with the emotions of the people of Delhi for the last five years.

"He obstructed the development of Delhi. And knowingly and unknowingly, he became a toy in the hands of anti-social and anti-India elements," Adityanath said.

The protest at Shaheen Bagh, he said, has disrupted traffic across the capital.

"A guest with an appointment to meet him at 9.30 am could only reach at 11. He told me he had left as early as 7 am but got stuck because of the traffic in Shaheen Bagh," he said.

The Uttar Pradesh chief minister also slammed Kejriwal for "sympathising" with elements who he said gave anti-India slogans in Jawaharlal Nehru University.