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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, Jul 11: India's COVID-19 case count crossed the eight lakh-mark on Saturday with yet another highest single-day spike of 27,114 new cases in the last 24 hours.

As many as 519 deaths were reported during this period.

The total number of positive cases in the country stands at 8,20,916, including 2,83,407 active cases, 5,15,386 cured/discharged/migrated and 22,123 deaths, according to the Ministry of Health and Family Welfare.

With as many as 2,38,461 COVID-19 cases, Maharashtra continues to remain the worst-affected state, followed by Tamil Nadu (1,30,261) and Delhi (1,09,140).

Meanwhile, 1,13,07,002 samples have been tested for COVID-19 till July 10. Out of these 2,82,511 samples were tested yesterday, according to the Indian Council of Medical Research (ICMR).

Mumbai, Jan 23: Rashmi Sahijwala never expected to start working at the age of 59, let alone join India’s gig economy—now she is part of an army of housewives turning their homes into “cloud kitchens” to feed time-starved millennials.

Asia’s third-largest economy is battling a slowdown so sharp it is creating a drag on global growth, the International Monetary Fund said Monday, but there are some bright spots.

The gig economy, aided by cheap mobile data and abundant labour, has flourished in India, opening up new markets across the vast nation.

Although Indian women have long battled for access to education and employment opportunities, the biggest hurdle for many is convincing conservative families to let them leave home.

But new apps like Curryful, Homefoodi, and Nanighar are tapping the skills of housewives to slice, dice and prepare meals for hungry urbanites from the comfort of their homes.

The so-called cloud kitchens—restaurants that have no physical presence and a delivery-only model—are rising in popularity as there is a boom in food delivery apps such as Swiggy and Zomato.

“We want to be the Uber of home-cooked food,” said Ben Mathew, who launched Curryful in 2018, convinced that housewives were a huge untapped resource.

His company—which employs five people for the app’s daily operations—works with 52 women and three men, and the 31-year-old web entrepreneur hopes to get one million female chefs on-board by 2022.

“We usually train them in processes of sanitisation, cooking, prep time and packaging... and then launch them on the platform,” Mathew told news agency.

One of the first housewives to join Curryful in November 2018 shortly after its launch, Sahijwala was initially apprehensive, despite having four decades of experience in the kitchen.

But backed by her children, including her son who gave her regular feedback about her proposed dishes, she took the plunge.

Since then, she’s undergone a crash course in how to run a business, from creating weekly menus to buying supplies from wholesale markets to cut costs.

The learning curve was steep and Sahijwala switched from cooking everything from scratch to preparing curries and batters for breads in advance to save time and limit leftovers.

She even bought a massive freezer to store fruits and vegetables despite her husband’s reservations about the cost.

“I told him that I am a professional now,” she told news agency.

‘Internet restaurants’

Kallol Banerjee, co-founder of Rebel Foods which runs 301 cloud kitchens backing up 2,200 “internet restaurants”, was among the first entrepreneurs to embrace the concept in 2012.

“We could do more brands from one kitchen and cater to different customer requirements at multiple price points,” Banerjee told AFP.

The chefs buy the ingredients, supply the cookware and pay the utility bills.

The apps—which make their money through charging commission, such as more than 18 percent per order for Curryful—offer training and supply the chefs with containers and bags to pack the food in.

Curryful chef Chand Vyas, 55, spent years trying to set up a lunch delivery business but finally gave up after failing to compete with dabbawalas, Mumbai’s famously efficient food porters.

Today Vyas works seven hours a day, five days a week in her kitchen, serving up a bevy of Indian vegetarian staples, from street food favourites to lentils and rice according to the app’s weekly set menus.

“I don’t understand marketing or how to run a business but I know how to cook. So, the current partnership helps me focus on just that while Curryful takes care of the rest,” Vyas told AFP.

She pockets up to $150 (Rs 10,000 approx) a month after accounting for the commissions and costs, but hopes to earn more as the orders increase.

In contrast, a chef at a bricks-and-mortar restaurant takes home a monthly wage of between $300 (Rs 20,000 approx) and $1,000 (Rs 70,000) approx for working six days a week.

With India’s cloud kitchen sector expected to reach $1.05 billion by 2023, according to data platform Inc42, other companies are also keen to get a slice of the action.

Swiggy, for example, has invested 2.5 billion rupees ($35.3 million) in opening 1,000 cloud kitchens across the nation.

Back in her Mumbai kitchen, Sahijwala is elated to have embarked on a career at an age when her contemporaries are eyeing retirement.

Over the past year, she has seen her profit grow to $200 (Rs 15,000 approx) a month, but more importantly, she said, “My passion has finally found an outlet.

“I am just glad life has given me this chance.”