Togadia demands for population control of Muslims

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.

New Delhi, Feb 17: Indian officials denied entry to British lawmaker Debbie Abrahams on Monday after she landed at New Delhi's Indira Gandhi International Airport.

Debbie Abrahams, a Labour Party Member of Parliament who chairs a parliamentary group focused on the Kashmir, was unable to clear customs after her valid Indian visa was rejected, her aide, Harpreet Upal, told The Associated Press.

Abrahams and Upal arrived at the airport on an Emirates flight from Dubai at 9 am. Upal said the immigration officials did not cite any reason for denying Abrahams entry and revoking her visa, a copy of which, valid until October 2020, was shared with the AP. A spokesman for India's foreign ministry did not immediately comment.

Abrahams has been a member of Parliament since 2011 and was on a two-day personal trip to India, she said in a statement.

"I tried to establish why the visa had been revoked and if I could get a 'visa on arrival' but no one seemed to know," she said in the statement.

"Even the person who seemed to be in charge said he didn't know and was really sorry about what had happened. So now I am just waiting to be deported ... unless the Indian Government has a change of heart. I'm prepared to let the fact that I've been treated like a criminal go, and I hope they will let me visit my family and friends."

Abrahams has been an outspoken critic of the Indian government's move last August stripping Jammu and Kashmir of its semi-autonomy and bifurcating the state into two Union Territories.

Shortly after the changes to Kashmir's status were passed by Parliament, Abrahams wrote a letter to India's High Commissioner to the UK, saying the action "betrays the trust of the people" of Kashmir.

India took more than 20 foreign diplomats on a visit to Kashmir last week, the second such trips in six months.

Access to the region remains tight, with no foreign journalists allowed.

Kolkata, Jan 15: The arrows of Mahabharata's Arjuna had atomic power, claimed West Bengal Governor Jagdeep Dhankhar, drawing sharp criticism from academicians, even as he joined a long list of politicians who have in recent years given bizarre interpretations linking mythology with science.

Speaking at the 45th Eastern India Science Fair and 19th Science and Engineering Fair on Tuesday, Dhankhar also claimed that flying objects existed during the period of Ramayana.

"It is said that the plane was invented in 1910 or 1911, but if we delve into our old scriptures we will see in Ramayana, we had 'uran khatola' (aircraft)," he said.

"Sanjaya narrated the entire war of Mahabharata (to Dhitarasthra) not from TV. The arrows of Arjuna in Mahabharata had atomic power in it," Dhankhar said, asserting that the world can no longer afford to ignore India.

According to Sanskrit epic Mahabharata, Sanjay, even after staying away from the battlefield, had narrated what was happening there to Dhritarashtra, who was blind.

Dhankhar, who has been in news for clashes with the Mamata Banerjee government ever since he assumed office in July last year, joins politicians such as Tripura Chief Minister Biplab Deb and UP deputy chief minister Dinesh Sharma to give odd interpretations of mythology.

While Deb had claimed that the internet existed during Mahabharata, Sharma suggested that godess Sita was a test tube baby.

Recently, Puducherry Lt Governor Kiran Bedi was trolled online for sharing a doctored video that claimed, "NASA recorded sound of sun -- Sun chants Om".

Indologist Nrisingha Prasad Bhaduri said governors appointed by the BJP government at the Centre are delving into everything and behave "as if they are know-alls".

"They fail to understand one thing that great writers have very strong power of imagination," Bhaduri said.

Scientist Sandip Chakraborty said such comments only hurt the scientific progress in India at the global forum.

"The ancient writers described all these things based on their imagination. It is true that India made a lot of progress during the ancient period, but such comments only damages the progress made by our scientific community," he said.