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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, Jan 31: The central government has decided that pensioners' life certificates will be collected from their doorstep, saving them from hassles of visiting pension disbursing banks.

The service will be charged an amount not exceeding Rs 60, according to a statement issued on Thursday by the Department of Pension and Pensioners' Welfare (DoPPW).

Every year a pensioner is required to give proof of him being alive to banks in order to ensure continued pension. These certificates can be submitted online or by visiting the bank.

"The department has taken a landmark step to make life easier for senior citizens to submit their annual life certificate for continued pension," it said.

Directions have been issued to all pension disbursing banks to send SMS or emails to all their pensioners on October 24, November 1, November 15 and November 25 every year reminding them to submit their annual life certificates by November 30, the statement said.

"The bank in addition will also ask such pensioners through SMS/email as to whether they are interested in submission of life certificate through a chargeable doorstep service, the charge not exceeding Rs 60, it said.

The department for stricter monitoring and in order to ensure that no pensioners are left out has also directed the banks to make an exception list on December 1 every year of those pensioners who fail to submit their life certificate and issue another SMS or email to them for submitting it.

The Central Pension Processing Cells (CPPC) of the pension disbursing banks shall now be duty bound to submit a report to the DoPPW in January, February and March.

The report will indicate the total number of pensioners who have not given their life certificate along with a breakup of the certificates submitted physically and through digital means, the statement said.

This is a landmark step from the side of the central government showing due care for pensioners, it said.

This step is in addition to the order issued in July last year, vide which all pensioners aged 80 years and above have been given an exclusive window to submit their life certificate w.e.f. 1st October every year instead of 1st November every year, the statement added.

Lucknow, Feb 14: Uttar Pradesh doctor Kafeel Khan was on Friday booked under the National Security Act (NSA) over his alleged anti-CAA speech at Aligarh Muslim University on December 12, 2019.

The Uttar Pradesh slapped NSA on Kafeel Khan on Friday even as the doctor waited to be released from jail despite being granted bail on Monday in connection with his alleged inflammatory speech.

SP Crime Dr Arvind said that there were sufficient grounds to book the doctor under NSA.

The suspended pediatrician, Kafeel Khan, was arrested for allegedly delivering a controversial speech during Anti-CAA protests on December 12 at the Aligarh Muslim University or AMU. While he was granted bail on Monday, his family members claimed on Thursday that he was yet to be released.

Dr Kafeel Khan's brother Adeel Ahmed Khan had issued a statement saying that despite being granted bail Mathura jail authorities had not honoured the court's order.

Dr Kafeel Khan was arrested by the UP Special Task Force from Mumbai on January 29 for participating anti-CAA protest at AMU. A case was registered against him at the Civil Lines police station here for promoting enmity between different religions.

After his arrest in Mumbai, Dr Khan was brought to Aligarh, from where he was shifted to the district jail in neighbouring Mathura.

According to police, this was done as a precautionary measure in view of the anti-CAA protests on the AMU campus and at the Eidgah grounds in the old city. Police had said that the Dr Khan's presence in the Aligarh jail could have aggravated the law and order situation in the city.

The doctor was earlier arrested for his alleged role in the death of over 60 children in one week at the BRD Medical College in Gorakhpur in August 2017. Short supply of oxygen at the children's ward was blamed at that time for the deaths.

About two years later, a state government probe cleared Khan of all major charges, prompting him to seek an apology from the Yogi Adityanath government.