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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.

Bengaluru, Feb 17: A combative ruling BJP is bracing to face the onslaught of the opposition Congress and the Janata Dal-Secular (JD-S) in the year's first legislature session beginning on Monday.

"We are ready to counter the opposition parties on any issue they want to raise or discuss, keeping in view the spirit of fairness in a democratic set-up, as we have the numbers to provide a stable government," party's state unit spokesman G. Madhusudhana told news agency here.

Ahead of the 3-day session, the BJP's legislature party met here under the leadership of Chief Minister B.S. Yediyurappa to chalk out its strategy to address issues, move bills and present the state budget for fiscal 2020-21.

"We hope the Congress and JD-S members will allow Governor Vajubhai Vala to address the joint session of the legislature on Monday and not disrupt his speech or walkout of the House before he concludes to maintain the dignity of his office," Madhusudhana said after the BJP meeting at a private hotel over dinner.

The legislature will resume the month-long budget session on March 2 with a special discussion for two days on the Constitution, markings the 70th year of its adoption and enforcement.

About 100 legislators, including the three Deputy Chief Ministers, the newly sworn-in cabinet ministers, council members and party's state unit members participated in the 2-hour long meeting.

"Yediyurappa, who also holds the Finance portfolio, will present the state budget for fiscal 2020-21 on March 5, which will be the fifth time as the fourth Chief Minister in over a decade," the official said.

Both the Houses will deliberate on the budget proposals and pass it by March 31.

In the 225-member Assembly, including one nominated, the ruling BJP has 117, opposition Congress 68, Janata Dal-Secular (JD-S) 34, Bahujan Samaj Party (BSP) one, Independents 2 and vacant 2.

Buoyed up by winning 12 of the 15 seats in the December 5 assembly by-elections, the party is confident of passing the finance and other bills, as it has the support of 119 members, including 2 Independents in the lower House.

"There is no threat to our government, which will complete the remaining 3-year term of the Assembly till May 2023. Yediyurappa has already won the majority test on July 29, 2019, three days after he took office for the fourth time," Madhusudhana said.

The Congress, however, asserted that it would raise the alleged misuse of police against the opposition members, anti-CAA protestors and minorities.

"We will question the morality of the government in making a tainted legislator like Anand Singh a forest minister when a dozen illegal mining cases are pending in the courts," a Congress official told news agency.

Bengaluru, Jun 19: The Karnataka government has been advised by its Educational Advisor to cancel holidays observed in educational institutions on the occasion of various Jayantis (birth annivesaries).

Advisor to Karnataka government on Education, Professor MR Doreswamy, has recommended cancellation of holidays on Jayanti and celebrate the day with more meaningful programmes remembering the great personalities.

The state government has declared public holidays on Valmiki Jayanti, Basava Jayanti, Kanaka Jayanti, Mahavir Jayanti, Ambedkar Jayanti and Gandhi Jayanti.

On Thursday, Doreswamy submitted a report containing seven key suggestions including cancelling holidays, to Deputy Chief Minister CN Aswath Narayan, who holds higher education portfolio.

Doreswamy in his report suggested to hold thematic workshops, lectures, conferences and other such activities to celebrate the life and works of the great personalities, instead of declaring holidays.

"It would not only educate our youth about the significance of the great personalities to our culture and society and also reinvents the tradition of paying tributes to their contributions to our civil society,'' he said.

Dr Narayan said that the decision on cancelling holidays on Jayanti's has to be taken by Chief Minister BS Yediyurappa.

Moreover, to bring education back on track during the present COVID-19 pandemic situation, Doreswamy made a few suggestions to complete exams of final semester engineering and graduate students. He also said that it was a challenge for the education sector to overcome the pandemic crisis and structure the next academic year 2021-22.

He also advised implementation of a mentoring system in all higher education institutions in Karnataka and empowering specially-abled students.