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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 18: Reliance Industries Ltd on Thursday said it has sold a 2.32 per cent stake in its digital unit to Saudi Arabia's Public Investment Fund (PIF) for Rs 11,367 crore, taking the cumulative fund raising to about Rs 1.16 lakh crore in two months.

Starting with Facebook Inc on April 22, Reliance has sold almost 25 per cent of equity in Jio Platforms - the maximum reports suggest the company intends to dilute to financial investors.

The investment by Saudi sovereign wealth fund is "at an equity value of Rs 4.91 lakh crore and an enterprise value of Rs 5.16 lakh crore", the company said in a statement.

With this investment, Jio Platforms has raised Rs 115,693.95 crore from some of the leading global investment powerhouses at a time when the world is deeply impacted by the coronavirus pandemic, resulting in a recession kind of environment for the global economy.

"With the addition of PIF's investment, Jio Platforms has established partnerships with a marquee set of global financial investors, who will contribute to establishing the Digital Society vision for India," the statement said.

Jio Platforms houses India's biggest telecom firm by subscribers, Reliance Jio. With more than 388 million users, Jio has forced out several rivals and driven consolidation in the sector since entering the market in 2016 with free voice services and cut-price data.

Over the past two months, billionaire Mukesh Ambani's oil-to-telecom conglomerate has announced the sale of about $14 billion of assets, completed a Rs 53,124 crore rights issue and slowed the run rate of new investment by a quarter.

These will help Reliance meet its target of paying off Rs 1.61 lakh crore of net debt by the end of the year.
This is PIF's largest investment into the Indian economy to date.

Ambani, chairman and managing director of Reliance Industries, said, "We at Reliance have enjoyed a long and fruitful relationship with the Kingdom of Saudi Arabia for many decades. From oil economy, this relationship is now moving to strengthen India's New oil (data-driven) economy, as is evident from PIF's investment into Jio Platforms."

Yasir Al-Rumayyan, governor of PIF, commented: "We are delighted to be investing in an innovative business which is at the forefront of the transformation of the technology sector in India. We believe that the potential of the Indian digital economy is very exciting and that Jio Platforms provides us with an excellent opportunity to gain access to that growth."

"This investment will also enable us to generate significant long-term commercial returns for the benefit of Saudi Arabia's economy and our country's citizens, in line with our mandate to safeguard and grow the national wealth of the Kingdom," he said.

The transaction is subject to Indian regulatory and other customary approvals.

Morgan Stanley acted as financial advisor to Reliance Industries and AZB & Partners and Davis Polk & Wardwell acted as legal counsels.

Prior to this deal, Reliance had sold 22.38 per cent of Jio Platforms to investors including Facebook Inc, securing Rs 104,326.95 crore in eight weeks.

Facebook kicked off the party, investing Rs 43,573.62 crore for a 9.99 per cent stake on April 22. This was closely followed by a further Rs 60,753.33 crore in investment.

Silver Lake - the world's largest tech investor - bought a 1.15 per cent stake in Jio Platforms for Rs 5,665.75 crore on May 4. It invested another Rs 4,546.80 crore for additional 0.93 per cent stake on June 5, taking its total holding to 2.08 per cent
Private equity KKR and Vista Equity Partners have taken 2.32 per cent stake each for Rs 11,367 crore apiece. KKR invested in Jio Platforms on May 22 while Vista invested on May 8.

Abu Dhabi sovereign wealth fund Mubadala Investment Co picked up 1.85 per cent in Jio Platforms for Rs 9,093.60 crore on June 5. Abu Dhabi Investment Authority on June 7 invested Rs 5,683.50 crore for a 1.16 per cent stake in Jio Platforms.

On May 17, global equity firm General Atlantic picked up 1.34 per cent stake in Jio Platforms for Rs 6,598.38 crore.

Global investment firm TPG on June 13 picked up 0.93 per cent for Rs 4,546.80 crore while L Catterton bought 0.39 per cent for Rs 1,894.50 crore.

New Delhi, 17: Tensions on the Indo-China border have spiked to the highest since 1962 after over 20 troops, including an Indian commanding officer, were killed in the face-off in Galwan valley that has seen a six-week long standoff underway with the Peoples Liberation Army.

The Army said that the soldiers – including the Commanding Officer of 16 Bihar regiment in charge of the area – died while a `de-escalation process’ was underway. Sources said that this death toll could rise up as some soldiers are currently not accounted for after PLA troops attacked with spiked sticks and stones in the Galwan valley.

Chinese side also has casualties but the number is still not known. The Indian death toll is perhaps the worst single day loss in decades and has come at a time when thousands of troops are forward deployed in Eastern Ladakh.

ET was the first to report on May 12 about a massive troop build up in the Galwan valley, which is an old flashpoint that had seen action in the 1962 war as well.

There have been reports of casualties on the Chinese side in the clash but numbers are currently not available. Worryingly, information from the ground suggests that several Indian soldiers, including four officers, are missing and could have been taken captive by a vastly larger Chinese force. Their status is still not known.

“During the de-escalation process underway in the Galwan Valley, a violent face-off took place yesterday night with casualties. The loss of lives on the Indian side includes an officer and two soldiers. Senior military officials of the two sides are currently meeting at the venue to defuse the situation,” an Indian Army statement reads.

The Ministry of External Affairs said that the clash occurred when the Chinese side violated the LAC. “On the late-evening and night of 15th June, 2020 a violent face-off happened as a result of an attempt by the Chinese side to unilaterally change the status quo there. Both sides suffered casualties that could have been avoided had the agreement at the higher level been scrupulously followed by the Chinese side,” a statement reads.

The loss of the Commanding Officer is especially devastating and he had been directly involved in de-escalation talks with the Chinese side, including one hours before the clash took place. Sources said that the talks on Monday morning had led to an agreement for Chinese forces to withdraw from Indian territory as part of the disengagement.

According to one version, the CO had gone to the standoff point with a party of 50 men to check if the Chinese had retreated as promised. As the Indian side proceeded to demolish and burn illegal Chinese structures on its side of the LAC, including an observation post constructed on the South bank of the river, a fresh stand off took place as a large force of Chinese troops returned back.

Sources said that a Chinese force in excess of 250 quickly assembled near Patrol Point 14 and were physically stopped by Indian soldiers from entering Indian territory. Soldiers from both sides did not use firearms but the Chinese soldiers carried spiked sticks to attack.

Given the terrain of the region, a part of the standoff and clash took place in the middle of the Galwan river that is currently flowing at full spate, leading to high casualties as injured soldiers got swept away. Indian soldiers have to cross the Galwan river at atleast five points to reach PP 14, which marks the LAC.

Chinese media reports on Tuesday quoted the spokesperson from its Western Theatre Command as laying claim over the Galwan valley region and blaming the Indian side for the clash. Reports quoted Col Zhang Shuili as saying that India has violated the consensus made during Army commander level talks.

As reported, Galwan river area has a painful history with China, with Peoples Liberation Army (PLA) soldiers surrounding a freshly set up Indian Army post in July 1962, in what would be one of the early triggers to the Sino-Indian war. At an Army post that was overrun at Galwan, 33 Indian soldiers were killed and several dozen taken captive in 1962.

In the past, the Doklam crisis in 2017 saw tensions building up along the Pangong Tso lake as well with soldiers engaging in a fight with sticks and stones. However, the Eastern Ladakh standoff is of a much more serious nature, with over 6000 Chinese troops lined up with tanks and artillery, faced off with a larger Indian forces. Troop build up has also been reported across the borders in Himachal Pradesh, Uttarakhand, Sikkim and Arunachal.