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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 3: Over 1 lakh scanned copies of Indians' national IDs, including Aadhaar, PAN card and passport, have been put on dark web for sale, cyber intelligence firm Cyble said on Wednesday.

The leaked data seems to have originated from a third party and not from the government system, according to a report by Cyble.

"We came across a non-reputed actor who is currently selling over 1 lakh Indian National IDs on the dark net. With such a low reputation, ideally, we would have skipped this; however, the samples shared by the actor intrigued our interest -- and also the volume. The actor is alleged to have access to over 1 lakh IDs from different places in India," Cyble said.

The personal data leaked by cyber criminals leads to various nefarious activities such as identity thefts, scams, and corporate espionage. Many criminals use the personal details in the IDs to win trust of the people over a phone call for fraudulent activities.

Cyber criminals leak personal data of 2.9 cr job-seeking Indians on dark web for free

The Cyble researchers acquired around 1,000 IDs from the seller and confirmed that the scanned IDs belong to Indians.

"Preliminary analysis suggests that the data originated from a third party, and no indication or artefact is indicating that it came from a government system. At this point, Cyble researchers are still investigating this further -- we are hoping to share an update soon," Cyble said.

The scanned ID documents indicate that the data may have been leaked from a company's data base in the segment where they have to comply with 'Know Your Customer' (KYC) norms.

"Cyble researchers have also learned about a surge in KYC and banking scams -- leaks such as this are often used by scammers to target individuals, especially elderlies," Cyble said.

The cyber intelligence firm has recommended people to refrain from sharing personal information especially financial information over phone, e-mail or SMS.

"Regularly monitor your financial transaction, if you notice any suspicious transaction, contact your bank immediately," the company said.

In May, Cyble showed two instances where personal data of 7.65 crore Indians have been put on sale in the dark web. In one instance, the seller claimed to have sourced data of 4.75 crore Indians from online directory Truecaller and in other, the seller claimed to have sourced from job websites.

Truecaller, however, had denied the claim of breach in its database.

Jaipur, Jul 14: In a show of strength, Deputy Chief Minister Sachin Pilot-led Rajasthan Congress camp on Monday released a video showing at least 16 MLAs sitting together.

This comes hours after the Congress held a legislature party meeting. Party leaders said 106 of 122 MLAs attended, a claim contested by the Pilot camp.

The 10-second video was shared late at night on Pilot's official WhatsApp group.

In the video, at least 16 MLAs are seen sitting together in a close circle. Pilot is not seen in the video.

Six other people can be seen in the video but they could not be identified.

Some of the MLAs seen in the video are Indraraj Gurjar, Mukesh Bhakar, Harish Meena.

Tourism Minister Vishvendra Singh tweeted the video with the caption "Family".

Ladnun MLA Mukesh Bhakar tweeted, "...Loyalty in Congress means Ashok Gehlot's slavery. That is not acceptable to us."

Pilot has been upset since he was denied the Rajasthan chief minister's post after the December 2018 assembly elections.

On Sunday, he claimed to have the backing of 30 Congress MLAs and "some independents".

Those close to him disputed Gehlot's claim that his government had a majority, and said this is proven in the assembly and not at the CM's house.

Sources close to him have also ruled out the possibility of Pilot joining the BJP.

In the 200-member Rajasthan Assembly, the Congress has 107 MLAs and the BJP 72. In the past, the ruling party has claimed the support of 13 independents, two MLAs each from the CPM and the Bharatiya Tribal Party, and one from the Rashtriya Lok Dal.