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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.

Bengaluru, Feb 25: Opteamix LLC (Opteamix), a digital technology firm, announced today that they have been awarded as a 'Dream Company to Work For' by the World HRD Congress.

Opteamix was ranked 11th in this category which had companies from multiple industries across the globe vying for the title.

In addition to the Dream Company ranking, Opteamix was also recognized for its innovative HR practices and Corporate Social Responsibility practices. The event took place at Taj Land's End in Mumbai on February 16.

Opteamix presented their concept 'Happiness at Work - When Culture drives Performance' that elaborated upon the methodology behind the enhancement of employee happiness.

"We have taken a holistic approach to help our people stay happy at work. While we knew that EQ and IQ were critical to the growth of people, we also believed that it is the Spiritual Quotient (SQ) which our in-house NGO - Right To Live caters to, that helps our people experience next-level career growth," said Varsha Dubey, Lead - Happiness and Learning Activator, while explaining the theory behind the happiness at work during the 30-min presentation before delegates from 65 countries.

"We have empowered our people by equipping them with the right set of tools to help them excel in their performance based on OKR (Objectives and Key Results), CFR (Communication, Feedback, and Review) and Competency Mapping. The optimum blend of these performance management tools has resulted in making a significant impact on the careers of our people and therefore, happy people and 100 per cent innovation and efficiency at work," added Shalu Priya - Director, People Experience.

Now in its 28th year, the World HRD Congress presents awards to organizations that promote innovative human resources practices. The award categories include leadership, talent management, employer branding, training and development, employee engagement, and more.

In the recent past, Opteamix had been recognized for its commitment to employee excellence with numerous awards and recognitions including 'Dream Companies to Work for' in 2017 and 2018.

World HRD Congress is billed as South Asia's largest HR event, featuring an eminent panel on international and local speakers from across public and private sectors.

The conference serves as a platform for the HR fraternity to deliberate on the insights, initiatives and implications of people management practices. The theme this year 'Happiness at work', recognized individuals and companies for their exceptional people management practices.

"We strongly believe in creating a culture of happiness at Opteamix. To us, happiness is as important as revenue and profits. The culture of happiness has been the Opteamix way of life since inception, which has led us to achieve our ultimate goals - higher career growth for all members and richer customer experience," said Raghurama Kote - Founder and COO of Opteamix, on being asked what a happy organization meant to him.

Bengaluru, Feb 24: Raising questions about the situation in Kashmir, senior Congress leader and former Karnataka chief minister Sidddaramaiah on Monday asked the BJP heading the union government to prove 'normalcy' by hosting US President Donald Trump's event in the valley.

If @BJP4India feels Kashmir has returned to Normalcy, & If @BJP4India feels that there is no govt orchestrated violence. Now is the time to prove the same by hosting @realDonaldTrump's event at Kashmir, Siddaramaiah tweeted.

Amid concerns raised by opposition parties, the government has said efforts have been made to restore normalcy in Jammu and Kashmir which faced months of restrictions after its special status under Article 370 was scrapped in August last year.

Siddaramaiah, who is Leader of Opposition in Karnataka Assembly, in another tweet hit out at Prime Minister Narendra Modi on the long wall built near the airport in Ahmedabad allegedly to block the view of a slum, ahead of Trump's visit.

It is time for @realDonaldTrump to get inspired from @narendramodi. Inspiration to build decorative walls to hide not so decorative life!! he tweeted. The opposition Congress in Gujarat had accused the BJP- ruled civic body in Ahmedabad of building the 500-meter long wall to block the view of a slum colony. Refuting the allegations, AMC officials had said the construction of the wall, around four feet in height, was approved much before Trump's Gujarat visit was finalised.

Trump, accompanied by First Lady Melania Trump and a high-level delegation, arrived in Ahmedabad around noon on Monday for a little less than a 36-hour-long trip.