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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.

Mumbai, May 14: The Shiv Sena on Thursday raised questions over the Centre's Rs 20 lakh crore stimulus package announced to revive the COVID-hit economy, and asked if India is not a "self-reliant" country at present.

An editorial in Sena mouthpiece 'Saamana' wondered how Rs 20 lakh crore will be raised, and opined that an environment needs to be created where industrialists, trade and business sectors are encouraged to invest.

On the path of new self-reliance, India cannot afford industrialists running away, and for that "political institutions like the ED and CBI need to be put in lockdown for some time," it said.

Prime Minister Narendra Modi on Tuesday announced new financial incentives on top of the previously announced packages for a combined stimulus of Rs 20 lakh crore, saying the COVID-19 crisis has provided India an opportunity to become self-reliant and emerge as the best in the world.

The Sena said the country is being told that the package will be beneficial for MSMEs (micro, small and medium enterprises), poor labourers, farmers and the tax-paying middle class.

"The package (as per the Centre) will reach 130 crore Indians and the country will become self-reliant. Does this mean India is not a self-reliant country at present?" the Marathi daily asked.

It is good that PPE kits and N95 masks are now being manufactured in India, it said.

"Any country progresses ahead while learning from crisis and through struggle. Before Independence, not even a needle was manufactured in India but in 60 years, India became self-reliant in science, technology, agro business, defence, manufacturing and atomic science," it said.

An institution like the Indian Council of Medical Research (ICMR), which is helping in the manufacturing of PPE kits, is part of the self-reliant India, it noted.

Wondering how Rs 20 lakh crore, as announced in the central package, will be raised, the Sena said an "environment needs to be created where industrialists, trade and business sectors will be encouraged to invest".

"India, on path of new self-reliance, cannot afford industrialists running away, and for that political institutions like the Enforcement Directorate (ED) and the Central Bureau of Investigation (CBI) need to be put in lockdown for some time," the paper said.

Despite announcing the 'lockdown-4' and the economic package, why its impact has not been reflected in the share market? it asked.

"Investors are in a dilemma. The prime minister and chief ministers must show them trust and support," it said.

"Earlier it was Pandit Nehru and now it is Modi. If (former prime minister) Rajiv Gandhi had not laid the foundation of a digital India, there wouldn't be video conference of PM, CMs and bureaucracy in times of coronavirus," the Uddhav Thackeray-led party said.

It agreed with Modi that coronavirus will stay for long, and lives need not revolve around it.

"We need to get back on our feet again," the Sena said.

The West Bengal government has suspended two women teachers in East Burdwan district on the charge of teaching pre-primary students from an English alphabet book consisting of a portion derogatory to the people with a dark complexion.

While presenting the alphabets with corresponding words and images, the book says U is for "Ugly". The illustration printed beside the letter is that of a boy with a dark complexion.

"The book is not part of the textbooks referred by the education department. It was introduced by the school itself. We have zero-tolerance for acts which instil prejudices into the minds of students," Education Minister Partha Chatterjee told reporters here on Thursday.

He said the two teachers of a local municipality-run school have been placed under suspension with immediate effect based on a preliminary investigation and stricter action would be taken against them later.

Though the school is now closed because of the lockdown, the matter came to light when the father of a student of the school was teaching him with the help of that book. He informed other parents and the education department was apprised of the issue, sources said.