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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.

New Delhi, Jun 1: India's COVID-19 tally on Monday witnessed its highest-ever spike of 8,392 cases, while 230 more deaths related to the infection were also reported in the last 24 hours, according to the Union Ministry of Health and Family Welfare (MoHFW).

The total number of coronavirus cases in the country now stands at 1,90,535 including 93,322 active cases, 91,819 cured/discharged/migrated and 5,394 deaths.

COVID-19 cases in Maharashtra continue to soar with the number reaching 67,655. Tamil Nadu's coronavirus count stands at 22,333 while cases in Delhi the number has reached 19,844

Dubai, May 5: Tickets on repatriation flights from UAE to India, which start on May 7, could be costlier than regular airfare, and adding to the financial woes of those flying back. Nearly 200,000 Indians in the UAE have registered on the website seeking to return home.

“A one-way repatriation ticket to Delhi will cost approximately Dh1,400-Dh1,650 - this would earlier have cost between Dh600-Dh700 [during these months],” said Jamal Abdulnazar, CEO of Cozmo Travel. “A one-way repatriation flight ticket to Kerala would cost approximately Dh1,900-Dh2,300.”

This can be quite a burden, as a majority of those taking these flights have either lost their jobs or are sending back their families because of uncertainty on the work front. To now have to pay airfare that is nearly on par with those during peak summer months is quite a blow.

Sources said that officials in Indian diplomatic missions have already initiated calls to some expats, telling them about likely ticket fares and enquiring about their willingness to travel.

Although many believed repatriation would be government-sponsored, Indian authorities have clarified that customers would have to pay for the tickets themselves. Those who thought they were entitled to free repatriation might back out of travel plans for now.

Fact of life

But aviation and travel industry sources say higher rates cannot be escaped since social distancing norms have to be strictly enforced at all times. That would limit the number of passengers on each of these flights.

“One airline can carry only limited passengers - therefore, multiple airlines are likely to get the approval to operate repatriation flights,” said Abdulnazar. “Also, airports will have to maintain safe distance for passengers to queue up at immigration and security counters.

“Therefore, it is recommended that multiple carriers fly into multiple Indian airports for repatriation to be expedited.”

The Indian authorities, so far, have not taken the easy decision to get its private domestic airlines into the rescue act. Gulf News tried speaking to the leading players, but they declined to provide any official statements. So far, only Air India, the national airline, has been commissioned to operate the flights.

Air India finds itself in the driver's seat when it comes to operating India's repatriation flights. To date, there is no confirmation India's private airlines will be allowed to join in.

UAE carriers ready to help out

UAE’s Emirates airline, Etihad, flydubai and Air Arabia are likely to also operate repatriation flights to India after Air India implements the first phase of services.

“We are fully supporting governments and authorities across the flydubai network with their repatriation efforts, helping them to make arrangements for their citizens to return home,” said a flydubai spokesperson.

“We will announce repatriation flights as and when they are confirmed, recognising this is an evolving situation whilst the flight restrictions remain in place.”

An AirArabia spokesperson said the airline is ready to operate repatriation flights when the government tells them to.

Travel agencies likely to benefit

Apart from operating non-scheduled commercial flights, the Indian government is also deploying naval ships to bring expat Indians back. Sources claim the ships are to ferry passengers who cannot afford the repatriation airfares.

Even then, considering the sheer numbers who will want to get on the flights, travel agencies are likely to see a surge in bookings since airline websites alone may not cope with the demand set off in such a short span.

Learn from Gulf governments

In instances when they carried out their own repatriation flights, some GCC governments paid the ticket fares to fly in their citizens. Those citizens who did not have the ready funds could approach their diplomatic mission and aid would be given on a case-to-case basis.

Should Indians wait for normal services to resume?

Industry sources say that those Indians wanting to fly back and cannot afford the repatriation flights should wait for full services to resume once the COVID-19 pandemic settles.

But can those who lost their jobs or seen steep salary cuts stay on without adding to their costs? And is there any guarantee that when flight services resume, ticket rates would be lower than on the repatriation trips.

As such, normal travel is expected to pick up only after the repatriation exercise to several countries is completed. UAE-based travel agencies are not seeing any bookings for summer, which is traditionally the peak holiday season.

“Majority want to stay put unless full confidence is restored,” said Abdulnazar. “I expect full normalcy to be restored not until March 2021.

“People have also taken a hit to their income. Without disposable income, you will curtail your travel.”

What constitutes normalcy?

Airfares are expected to remain high, given the need to keep the middle seats empty to practise safe distance onboard.

“We expect holiday travel to resume by October or November - but, the travel sentiment will not go back to pre-COVID-19 levels anytime soon,” said Manvendra Roy, Vice-President – Commercial at holidayme, an online travel agency. “The need to keep the middle seat vacant will add 30-40 per cent pricing pressure per seat from an airline perspective.

“This will make holidays more expensive.”

As for business travel, it will take some time to recover. Corporate staff are now used to getting work done via conference calls. “Companies will also curtail their travel expenditure since their income has taken a hit,” said Abdulnazar.