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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.

Jun 19: Ten Indian Army soldiers including four officers were released by the China’s People’s Liberation Army (PLA) on Friday capping three days of hard negotiations that followed the bloody battle at the eastern Ladakh’s Galwan valley on Monday.

The 10 jawans returned around 5.30 PM on Friday to Patrol Point 14 (PP-14) after Indian team leader Major Gen. Abhijit Bapat, the commanding officer of the Third Div made it clear to the Chinese that there couldn’t be any progress in the disengagement talks unless the soldiers were returned safely.

Asked to comment on the release of Indian soldiers, the Indian Army maintained silence. The force released a brief statement on Thursday stating that all its men were accounted for.

However, the extent of the brutal clash can be gauged from the fact that 76 Indian Army soldiers are still in the hospital out of which 58 soldiers have “minor injuries” and “should be back on duty within a week”, according to Army sources.

Return of the Indian soldiers has been the main point of negotiations for the last two days. The situation is now calmer at areas near PP-14 in the Galwan valley after the return of Indian soldiers even though large numbers of troops from both sides are still present in the area.

Meanwhile analysis of satellite images has revealed a large presence of Chinese troops in the northern banks of Pangong Tso, a disputed territory for years.

“In the past month, Chinese forces have become an overwhelming majority in the disputed areas (on the north bank of the 135 km long lake). Significant positions have been constructed between Fingers 4 and 5, including around 500 structures, fortified trenches and a new boat shed over 20 km further forward than previously. More structures appear to be under construction,” says a report published in the Strategist, the journal of the Australian Strategic Policy Institute.

“The scale and provocative nature of these new Chinese outposts is hard to overstate: 53 different forward positions have been built, including 19 that sit exactly on the ridge line separating Indian and Chinese patrols,” says the report, accompanied by satellite images showing overwhelming PLA presence.

The June 6 Corps Commander level meeting between the Indian and PLA armies did not result in a solution to the contentious muscle flexing by the Chinese on the shores of the Pangong lake. The meeting ended with the conclusion that more Lt Gen level talks between the two armies were needed to resolve such issues.

New Delhi, May 11: Shares of Indian Railway Catering And Tourism Corporation (IRCTC) jumped 5 per cent in early trade on Monday after the Indian Railways said it will gradually resume passenger train services from May 12.

The company's shares gained 5 per cent to Rs 1,302.85 -- its highest trading permissible limit for the day -- on the BSE. At the National Stock Exchange (NSE), it rose 5 per cent to Rs 1,303.55 -- its upper circuit limit.

Booking for reservation in these trains will start at 4pm on May 11 and will be available only on the IRCTC website.

The Indian Railways will gradually resume passenger train services from May 12 and will ask passengers to arrive at the station at least an hour before departure, the national transporter said on Sunday.

Initially, the all air-conditioned services will begin on 15 Rajdhani routes and the fare would be equivalent to that of the super-fast train, it said.

The special trains will run from New Delhi to Dibrugarh, Agartala, Howrah, Patna, Bilaspur, Ranchi, Bhubaneswar, Secunderabad, Bengaluru, Chennai, Thiruvananthapuram, Madgaon, Mumbai Central, Ahmedabad and Jammu Tawi.

All passenger services were suspended due to a lockdown announced on March 25 and the railways later started the on-demand Shramik Specials to ferry migrants stranded across the country. It, however, has been running freight and parcel services.