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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, Mar 9: A war of words broke out between the BJP and the Congress on Sunday over the Yes Bank crisis with the ruling party seeking to link it with the Gandhi family, while the opposition wondered if the prime minister and finance minister were "complicit" as the bank's loan book grew manifold.

Posting on Twitter a clip of a news channel report that Rana Kapoor, the arrested Yes Bank founder, had bought a painting from Congress leader Priyanka Gandhi Vadra, BJP's information and technology wing in-charge Amit Malviya alleged that every financial crime in India has "deep links" with the Gandhis.

The Congress dismissed the charge "fake" and called it a "diversionary" tactic.

It said Priyanka Gandhi had sold an M F Hussain painting of her father Rajiv Gandhi to Kapoor for Rs 2 crore, and the entire amount was disclosed in her income tax return of 2010.

Malviya tweeted, "Every financial crime in India has deep link with the Gandhis. Mallya used to send flight upgrade tickets to Sonia Gandhi. Had access to MMS (Manmohan Singh) and PC (P Chidambaram). Is absconding. Rahul inaugurated Nirav Modi’s bridal jewellery collection, he defaulted. Rana bought Priyanka Vadra’s paintings."

Congress' chief spokesperson Randeep Surjewala asked how does an M F Hussain painting of Rajiv Gandhi sold 10 years ago by Priyanka Gandhi to Yes Bank owner Rana Kapoor and disclosed in her tax returns connect with unprecedented giving of loans of Rs 2,00,000 crore in five years of the Modi government.

"More so, when (Kapoor's) proximity to BJP leaders is well known," he said.

Rubbishing the BJP's allegation, Congress spokesperson Abhishek Manu Singhvi at a press conference said it was a "diversionary" tactic by the government.

He noted that the bank's loan book rose from Rs 55,633 crore in March 2014, the year Narendra Modi became prime minister, to Rs 2,41,499 crore in March 2019.

"Why did the loan book rise by 100 per cent in two years after demonetisation i.e from Rs 98,210 cr in March 2016 to Rs 2,03,534 ar in March 2018? Were PM and FM sleeping, ignorant or complicit?" he asked.

The entire amount Priyanka Gandhi had received was in cheque and was fully disclosed in the income tax return, Singhvi said.

Surjewala, taking to Twitter, said instead of diverting from the real issue of people's money sinking into a bad bank, should not the government answer questions like how did loans given by Yes Bank rise from Rs 55,633 crore in March 2014 to Rs 2,41,499 crore in March 2019, an increase of almost Rs 2,00,000 crore in fiver years of the Modi government.

Why did the loans given by Yes Bank rise by a whopping 100 per cent in just two years after demonetisation, he asked.

Surjewala also questioned why did the prime minister address a conference sponsored by Yes Bank on March 6 despite the RBI moratorium.

"Why did the Haryana BJP government deposit over Rs 1,000 crore in Yes Bank a month ago, knowing that it was sinking? Is this figure Rs 3,000 cr? Did Fadnavis government in Maharashtra make similar deposits?" Surjewala asked.

"Of course, the government's media proxies won't dare to ask these questions. But the nation wants to know!" he said in a series of tweets.

Kapoor, 62, was arrested by the Enforcement Directorate in Mumbai after charges of alleged financial irregularities and mismanagement in the bank's operations surfaced and the RBI and Union government initiated action to control its affairs.

Farukkhabad, Jan 14: In a shocking incident, a new-born baby was mauled to death by a dog inside the operation theatre (OT) of a private hospital in Farukkhabad on Monday.

Family members of the baby boy said that they noticed the hospital staff shooing a dog away from inside the operation theatre and soon after, they were told the baby boy, born just two hours ago, was dead.

The family members said that they found the baby's body on the floor and it had deep gashes around the neck and other parts of the body.

District magistrate Manvendra Singh has ordered an FIR and the Chief Medical Officer (CMO) Chandra Shekhar said the hospital has been sealed and an inquiry ordered into the incident.

Sources said that the hospital where the incident took place was unregistered and was being run adjacent to a government hospital.

According to the FIR lodged with Sadar Kotwali police, the infant's father Ravi Kumar said he had admitted his wife Kanchan in the hospital on Monday and she was taken for a C-section to the operation theatre.

After the delivery, Kanchan was shifted to the ward but the family was told that the baby would be shifted later.

An hour later, the family was informed that the baby had died.

The family members then saw the hospital staff trying to chase a dog out of the operation theatre.

The family members forced their way into the operation theatre and found the infant lying on the floor with several injuries on the neck.

The police said that the baby's body has been preserved for examination and post mortem.

The FIR has been registered against Dr Mohit Gupta, and some of the staff members who were present during the delivery.

The hospital owner, Vijay Patel, however, feigned complete ignorance about the incident and said that he had been told that the baby was born dead.