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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.

Follow latest updates on the Covid-19 pandemic here

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, Jul 20: Reiterating that China has still occupied India's territory, Congress leader Rahul Gandhi on Monday attacked Prime Minister Narendra Modi saying that he has fabricated a fake strongman image to come to power which has now become India's biggest weakness as he has to protect the idea of 'Chhapan Inch'.

Taking to Twitter, the Congress leader posted a video message and wrote, "PM fabricated a fake strongman image to come to power. It was his biggest strength. It is now India's biggest weakness."

In the video message, speaking on "China's Strategic Game Plan" the Congress leader said: "What is China's strategic and tactical game plan? It is simply not a border issue. The worry I have is that the Chinese are sitting in our territory today. Chinese don't do anything without thinking about it strategically."

"In their mind, they have mapped out the world and they are trying to shape the world. That's the scale of what they are doing. That's what Gwadar is, that is what belt and road is. It is a restructuring of the planet. So when you are thinking about the Chinese you have to understand that that is the level at which they are thinking," he added.

Now at the tactical level, they're trying to improve their position. Whether it is Galwan, whether it's Demchok or whether it is Pangong Lake. The idea is to position themselves, he said.

"They are disturbed by our highway they want to make our highway redundant and if they are thinking larger scale, they want to do something with Pakistan in Kashmir. So it is not simply a border issue. It is a border issue designed to put pressure on the Prime Minister of India," the Congress leader said.

"And they are thinking of putting pressure in a very particular way. And what they are doing, is that they are attacking his image. They understand that it in order for Mr Narendra Modi to be an effective politician; in order for Mr Narendra Modi to survive as a politician, he has to protect the idea of--Chhapan Inch. And this the real idea the Chinese are attacking. They are basically telling Mr Narendra Modi that if you do not do what we say, we will destroy the idea of Mr Narendra Modi as a strong leader," he added.

Gandhi continued saying, now the question is, how will PM Narendra Modi react. Will he take them on? Will he take on the challenge and say absolutely not, I'm the Prime Minister of India. I do not care about my image I'm going to take you on. Or will he succumb to them?

"The worry I have so far is that the Prime Minister has succumbed. The worry I have is, the Chinese are sitting in our territory today and the Prime Minister has said publicly they are not, which to me tells me that is worried about his image and defending his image," said Gandhi.

"And if he allows the Chinese to understand that they can manipulate him because of his image, the Indian Prime Minister will no longer be worth anything for India," he added.

New Delhi, Jul 16: A group of 174 Indian nationals, including seven minors, has filed a lawsuit against the recent presidential proclamation on H-1B that would prevent them from entering the United States or a visa would not be issued to them.

Judge Ketanji Brown Jackson at the US District Court in the District of Columbia issued summonses on Wednesday to Secretary of State Mike Pompeo and acting Secretary of Homeland Security Chad F Wolf, along with Labor Secretary Eugene Scalia.

The lawsuit was filed in the US District Court on Tuesday.

"The proclamation 10052's H-1B/H-4 visa ban hurts the United States' economy, separates families and defies the Congress. While the two former points render it unseemly, the latter point renders it unlawful," said the lawsuit filed by lawyer Wasden Banias on behalf of the 174 Indian nationals.

The lawsuit seeks an order declaring the presidential proclamation restriction on issuing new H-1B or H4 visas or admitting new H-1B or H-4 visa holders as unlawful. It also urges the court to compel the Department of State to issue decisions on pending requests for H-1B and H-4 visas.

In his presidential proclamation on June 22, Trump temporarily suspended issuing of H-1B work visas till the end of the year.

"In the administration of our nation's immigration system, we must remain mindful of the impact of foreign workers on the United States labor market, particularly in the current extraordinary environment of high domestic unemployment and depressed demand for labor," said the proclamation issued by Trump.

In his proclamation, Trump said the overall unemployment rate in the United States nearly quadrupled between February and May of 2020 -- producing some of the most extreme unemployment ever recorded by the Bureau of Labor Statistics.

While the May rate of 13.3 per cent reflects a marked decline from April, millions of Americans remain out of work.

The proclamation also extends till year-end his previous executive order that had banned issuance of new green cards of lawful permanent residency. Green Card holders, once admitted pursuant to immigrant visas, are granted "open-market" employment authorisation documents, allowing them immediate eligibility to compete for almost any job in any sector of the economy, Trump said.

Forbes, which first reported the lawsuit filed by the Indian nationals, said the complaint points out that the Congress specified the rules under which H-1B visa holders could work in the US and balanced the interests of US workers and employers.

"The complaint seeks to protect H-1B professionals, including those who have passed the labor certification process and possess approved immigrant petitions. Such individuals are waiting for their priority date to obtain permanent residence, a wait that can take many years for Indian nationals," Forbes reported.

Meanwhile, several lawmakers urged Scalia on Tuesday to reverse the work visa ban.

"Throughout this administration, the president has continued to lament the alleged abuses of the immigration system while failing to address the systemic problems that have persisted and allowed businesses and employers to exploit and underpay immigrant workers, guest workers and American workers," the lawmakers wrote.

"This misguided attempt by the president to scapegoat immigrants for policy failures during the pandemic not only serves to hurt immigrants, but dismisses the true problem of a broken work visa program that is in desperate need of reform," said the letter, which among others was signed by Congressmen Joaquin Castro, Chair of the Congressional Hispanic Caucus; Bobby Scott, Chair of the Education and Labor Committee; Karen Bass, Chair of the Congressional Black Caucus; Judy Chu, Ra l Grijalva, Vicente Gonzalez, Yvette Clarke and Linda S nchez.