After CAA, Centre might bring population control law: Niranjan Jyoti

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 11: With Election Commission">Election Commission's trends indicating a landslide victory for the Aam Aadmi Party (AAP), party chief Arvind Kejriwal expressed his gratitude towards the people of the national capital and said that this is the victory of the people who consider him as their son.

Making his first public appearance after the day's results, Kejriwal made a brief address to supporters in which, AAP chief thanked supporters, outlined his personal connection with citizens and party workers as well as credited his family for their continued support.

"I thank people of Delhi for reposing their faith in AAP for the third time. This is not my personal victory, this is the victory of Delhiites. This the victory of the people who consider me as their son and voted for us," Kejriwal said at party office here.

He also referred to the trends of the assembly polls, as the beginning of a new kind of politics.

"This is the beginning of a new kind of politics. This is a new sign. Only the party will get vote who will built mohalla clinics and good schools... This is the victory of mother India and India. Today is Tuesday, Hanuman-ji's day. Hanumanji ji blessed Delhi today, I thank him. We pray that Hanuman Ji keeps showing the right path to us so that we continue to serve people for the next five years," he said.

According to Election Commission", AAP won 5 seats while the party is leading on 58 seats in 70-member Delhi Assembly. 

New Delhi, Apr 15: Tablighi Jamaat leader Maulana Saad Kandhalvi has been booked for culpable homicide after some of the attendees of the religious congregation died due to coronavirus, police said on Wednesday.

Kandhalvi had organised the religious gathering at Nizamuddin Markaz last month against the social distancing protocol imposed by the Centre to curb the spread of the deadly disease.

An FIR was registered against the cleric on March 31 at Crime Branch police station on a complaint of the Station House Officer of Nizamuddin.

He was earlier booked for holding the event, police said.

“After several attendees of the Tablighi Jamaat event succumbed to coronavirus, we added IPC section 304 (culpable homicide not amounting to murder) in the FIR against the leader, a police official said.

Some foreigners who attended the event have also been booked for violation of visa norms.

In an audio message, Kandhalvi had said that he was exercising self-quarantine after several hundreds who visited the Tablighi Jamaat congregation at Nizamudddin Markaz tested positive for coronavirus.

The FIR registered against the Tablighi Jamaat event says that the Delhi Police contacted the authorities of Nizamuddin Markaz on March 21 and reminded them of the government order which prohibited any political or religious gathering of more than 50 people.

It says that despite repeated efforts, the event organisers failed to inform the health department or any other government agency about the huge gathering inside the Markaz and deliberately disobeyed government orders.

“The sub district magistrate of Defence Colony inspected the premises several times and found that around 1,300 people, including foreign nationals, were residing there without maintaining social distance. It was also found that there were no arrangements of hand sanitizers and face masks,” the FIR adds.

The Nizamudddin centre, attended by thousands, turned out to be a hotspot for spread of coronavirus not only in the national capital, but the entire country.

More than 25,500 Tablighi members and their contacts have been quarantined in the country after the Centre and the state governments conducted a "mega operation" to identify them.

At least 9,000 people participated in the religious congregation in Nizamuddin. Later, many of the attendees travelled to various parts of the country.