AAP will campaign for BJP in Lok Sabha polls if Delhi granted statehood: Kejriwal

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.

London, May 11: Fugitive diamond merchant Nirav Modi's five-day extradition trial over the nearly USD2 billion Punjab National Bank (PNB) fraud and money laundering case is set to begin in London's Westminster Magistrates' Court today.

The London High Court rejected Nirav Modi's bail plea in Punjab National Bank (PNB) bank fraud case for the fifth time in early March.

Modi, the prime accused in the PNB fraud case, is currently lodged at Wandsworth prison in south-west London and is wanted for his alleged role in the Rs 13,570 crore loss caused to the Punjab National Bank (PNB) along with his uncle, Mehul Choksi.

Modi, 48, was arrested in March last year by Scotland Yard in connection with the case.

Modi was remanded in custody till February 27, 2020, after he appeared before a UK court on Thursday via video link from his London prison.

The latest bail hearing followed further assurances by Modi, including an increase in the amount of security he had offered as a guarantee as well as stricter bail conditions.

On his last bail application, Modi offered USD 4 million as a security guarantee in return for bail, an offer that was rejected by judges who ruled that there was a real risk that Modi would flee the UK to a country which has no extradition treaty with India.

At the same hearing, the judge ruled that there was "strong evidence" that Modi had engaged in "witness intimidation" and destroying evidence.

Given the seriousness of such allegations, it was all but certain that the latest bail application would be rejected.

Modi's lawyers had contended that their client was being held in difficult conditions at Wandsworth prison and had also claimed that his mental health was deteriorating as a result of his incarceration.

However, ruling at the High Court today, Justice Ian Dove said there was a "clear need for this application to be refused in the present circumstances."

It comes just days after the second sale of assets belonging to Modi valued at millions of dollars.

The items include a luxury Rolls Royce car, a Patek Philippe watch and a painting by the renowned Indian artist Amrita Sher-Gil valued at USD 2.5 million but expected to fetch considerably more.

Meanwhile, Nirav's brother Neeshal Modi, who is also one of the co-conspirators in the PNB scam, has written to Enforcement Directorate, distancing himself from his brother's actions and said that he had no knowledge of it.

New Delhi, Apr 15: CPI-M leader Sitaram Yechury has sought a substantial increase in relief spending of the Central government in the fight against coronavirus, saying that there should be cash transfer of Rs 7,500 to families not paying income tax and distribution of free foodgrains to all needy.

In an article in the forthcoming issue of the party's mouthpiece -- People's Democracy -- Yechury said that India ranks among the countries that are testing the least for the coronavirus and testing should be increased rapidly.

Yechury said the financial stimulus package should be raised from the current 0.8 per cent to at least 5 per cent of GDP and States should be provided liberal funding.

"We must ensure that there are no starvation deaths that occur in our country. It is, therefore, imperative that the government must immediately implement a Rs 7,500 ex gratia cash transfer to all non-income tax-paying families and resort to universal distribution of free foodgrains to all needy people," Yechury said.

He said all MGNREGA workers should be paid wages irrespective of work and employers should be assisted financially to protect workers from job losses and wage cuts and arrangement should be made for the return of migrant workers to their homes.

"Testing is of crucial importance to identify the clusters where the pandemic is spreading in order to isolate and insulate them to contain the community spread. Inadequate testing does not provide us with such information. It is dangerous both for the inability to contain the spread and to identify the critical areas," the article said.

It said that till April 9, India's record of testing was 0.092 per thousand, while in Germany it was 15.96, Italy 14.43, Australia 12.99, Denmark 10.73 and Canada 9.99. "Unless our testing rate increases substantially, our strength to combat the pandemic will not grow," the article said.

Yechury said that the first case in India was reported on January 30 and "no substantive measures were taken despite this for seven long weeks" until the declaration of the lockdown on March 24.

"As far as the lockdown is concerned, many countries in the world moved with greater urgency - China locked down Wuhan on January 23, the whole of Italy was locked down on March 10, USA declared a national emergency on March 13, Spain on March 14, France on March 17 and UK on March 23," he said.

Yechury said the people were looking forward to the Prime Minister's address to the nation on the last day of the three-week countrywide lockdown.

"These three weeks have thrown up many experiences that need to be addressed urgently in order, both, to strengthen our fight against the COVID-19 pandemic and to protect the lives and survival of crores of our fellow citizens. On none of these issues of vital importance did the Prime Minister have anything substantial to say," he said.