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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.

Kolkata, Mar 1: The Calcutta High Court has ruled that it is not mandatory for foreigners to produce a valid passport and its particulars for processing of application for grant of Indian citizenship if he is able to satisfy the appropriate authorities the reasons for non-availability of the document.

Justice Sabysachi Bhattacharya passed the order while disposing off a petition by granting the petitioner liberty to file an application before the authority "as contemplated in Rule 11 of the Citizenship Rules 2009, upon furnishing explanation as to the non-availability of the passport".

Bismillah Khan had filed the petition saying he was being denied the citizenship of India because of his inability to file an application under Section 5 (1) (c) of the Citizenship Act, 1955, apparently due to the mandatory requirement of furnishing a copy of the passport for such application.

The petitioner's counsel submitted that Khan was a Pakhtoon citizen and due to political turmoil in the said state, which subsequently merged partially into Afghanistan and partially into Pakistan, he, as a five-year old, had to migrate to India with his father in 1973.

Under such circumstances, the petitioner could not have any opportunity of having a valid passport, since they were refugees under distress, the counsel said.

The petitioner had previously approached a coordinate Bench of the court, wherein a single judge, passed an order on July 25, 2018, directing him to comply with the formalities required, as communicated by the secretary to the Government of India to the Secretary to the Government of West Bengal (Home), vide a letter dated December 7, 2017.

The court had then also given liberty to the petitioner to apply afresh before the appropriate authority under Section 5(1)(c) of the 1955 Act, having complied with all the formalities.

The petitioner then moved Bhattacharya's court submitting that a complete application as directed by the Coordinate Bench cannot be possibly filed by his client due to the mandatory requirement of uploading a copy of his passport, which the petitioner does not have due to reasons beyond his control.

The counsel said Khan is married to an Indian citizen, has a daughter and living in India for close to half a century.

The counsel for the union of India submitted that in view of no application having been filed by the petitioner, there is no scope of granting such proposed application at the present juncture for the Union.

The counsel argued that it is mandatory to file an application in Form III for the application of the petitioner under Section 5(1)(c) of the Act to be considered at all.

In view of the petitioner not complying with the mandatory requirement of submitting a copy of his passport, the state government cannot, under the law, forward such application to the union government.

After hearing all sides, Justice Bhattacharya said although the rule "contemplates that an application shall not be entertained unless the application is made in Form III, such provision ipso facto does not make the availability of a passport a mandatory requirement".

"..the Form given with the Rules or the Rules themselves cannot override the provision of the statute itself, under which the said Rules are framed, which does not stipulate such a mandate on the applicants for citizenship under Section 5 (1)(c) of the 1955 Act mandatorily to carry a passport".

The court said although such provision is included in the Form, which has to be complied with by the applicant, "it is nowhere indicated in such Form that all the relevant particulars, including the particulars regarding passport of the petitioner have to be furnished mandatorily, along with a copy of a valid foreign passport, even in the event the petitioner, for valid reasons, is not in a position to produce such passport".

Justice Bhattacharya ruled that under such circumstances, it cannot be held that the provision of producing a passport and its particulars is mandatory in nature and there has to be a relaxation in such requirement "in case the petitioner is able to satisfy the appropriate authorities the reasons for non- availability of such passport".

"Unless such a leeway is given to the applicants, genuine persons who otherwise have all the formal documents indicating that they have been residing in India for a long time and have married a resident of India would also be unable to apply for Indian Citizenship despite having lived their entire lives and contributed to the economy and diverse culture of this country."

He said such a scenario would be contradictory to the spirit of Article 14 of the Constitution of India.

"In such view of the matter, the requirement of having a passport has to be read as optional in Form III of the Citizenship Rules, 2009 and the authorities are deemed to have the power to relax such 6 requirement in the event the applicant satisfied the authorities for genuine reasons why the applicant is not in a position to produce such passport," the February 24 order said.

The court ruled that despite the provision of making applications online, a provision has to be made for persons who do not have all the particulars of their passport, which is read as optional, to file applications manually, which are to be treated as valid applications under Rule 5 of the Citizenship Rules, 2009.

The court also ordered that alternatively the necessary software be amended so that the online applications can be presented with or without passports, in the latter case furnishing detailed reasons as to non-furnishing of passports.

"Sanctioning of such forms, however, will be conditional upon the satisfaction of the relevant authorities about the reasons for the applicant not being able to produce her/his passport," the order said.

Minneapolis, Jun 2: An official autopsy released Monday ruled that George Floyd, the African-American man whose death at police hands set off unrest across the United States, died in a homicide involving "neck compression".

George, 46, died of "cardiopulmonary arrest complicating law enforcement subdual, restraint, and neck compression," and the manner of death was "homicide," the Hennepin County Medical Examiner in Minneapolis said in a statement.

Floyd's other significant health conditions were listed as "arteriosclerotic and hypertensive heart disease; fentanyl intoxication; recent methamphetamine use."

The statement added that the "manner of death is not a legal determination of culpability or intent."

It emphasized that under Minnesota state law "the Medical Examiner is a neutral and independent office and is separate and distinct from any prosecutorial authority or law enforcement agency."