Resolving people's issues priority: Aaditya Thackeray

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, Apr 11: As India battles the Covid-19 crisis, Prime Minister Narendra Modi on Saturday held a video conference with chief ministers primarily to take their feedback on whether the 21-nation-wide lockdown be extended beyond April 14 to stem the tide of the infections.

The Central government is understood to have also obtained views on the issue from all the relevant agencies and stakeholders involved in the efforts to contain the spread of the pandemic.

The video conference, which began at 11am, comes amidst indications that the central government may extend the nationwide lockdown with some possible relaxations even as Punjab and Odisha have already announced extending the lockdown beyond April 14 when the current spell of 21-day shutdown across the country ends on Tuesday.

The Union Home Ministry has sought views of state governments on various aspects, including whether more categories of people and services need to be exempted. In the current lockdown only essential services are exempted.

This is for the second time the prime minister is interacting with the chief ministers via video link after the lockdown was imposed.

During his April 2 interaction with chief ministers, Modi had pitched for a "staggered" exit from the ongoing lockdown.

A PTI tally of numbers reported by various states as on Thursday at 9.30pm showed a total of 7,510 having been affected by the virus nationwide so far with at least 251 deaths. More than 700 have been cured and discharged. However, the last update from the Union Health Ministry put the number of confirmed infections at 7,447 and the death toll at 239.

Addressing floor leaders of various parties who have representation in Parliament, Modi had on Wednesday made it clear that the lockdown cannot be lifted in one go, asserting that the priority of his government is to "save each and every life".

According to an official statement after the Wednesday interaction, the prime minister told these leaders that states, district administrations and experts have suggested extension of the lockdown to contain the spread of the virus.

Before the lockdown was announced on March 24, the prime minister had interacted with the chief ministers on March 20 to discuss ways and means to check the spread of the novel coronavirus.

New Delhi, Feb 10: Former finance minister P Chidambaram on Monday tore into the Modi government's handling of the economy, saying it was close to collapse and was been attended by "very incompetent doctors."

Initiating the debate on the Union Budget for 2020-21, he said rising unemployment and falling consumption was making India poorer.

The economy, he said, is facing demand constraints and is investment starved. The economy is facing fall in consumption and rising unemployment.

"Fear and uncertainty prevails in the country," he added.

He said the chief economic advisor to the BJP government for four years, Arvind Subramanian has stated that the economy is in the ICU. But "I would say the patient has been kept out of ICU and incompetent doctors are looking at the patient," Chidambaram said.

"It is dangerous to have a patient out of ICU and being looked upon by incompetent doctors. What is the point standing around and chanting slogan 'Sab ka saath, sab ka vishwas'," he said, adding every competent doctor the Modi government could ever identify has left the country.

His said a list of such people included former RBI governor Raghurman Rajan, former CEA Arvind Subramanian, former RBI governor Urjit Patel and former NITI Aayog vice chairman Arvind Panagariya.

"Who are your doctors, I want to know," he said, adding the government considers Congress as untouchable and doesn't think of any good about the rest of the opposition and so doesn't consult them.

Chidambaram charged that instead of putting money in the hands of people, the Modi government "put money in hands of 200 corporates" by way of corporate tax.

He said Finance Minister Nirmala Sitharaman in her 160- minute budget speech did not talk of the economy and its management.

"You are living in echo chambers. You want to hear your own voice," he said.

Listing problems with the Modi government, Chidambaram said it refuses to admits in mistakes, lives in denial and has predispositions.

The demonetisation of old 1000 and 500 rupee notes, as well as the hurried implementation of the Goods and Services Tax (GST), are "monumental blunders" that ruined the economy, he said, adding the Modi regime is predisposed to protectionism, a 'strong' rupee and is against bilateral and multilateral agreements.

"It is living in denial," he said, adding the economic growth has fallen for hereto unseen six consecutive quarters.

He wondered on the narrative Finance Minister Nirmala Sitharaman was trying to give after reading out a 160-minute budget speech with few pages left unread.

Her budget neither made any reference to the Economic Survey nor picked up a single idea from it, he said.

Chidambaram, who is credited with presenting a 'dream budget' more than two decades back, said the GDP growth has declined for six consecutive quarters, agriculture is growing by just 2 per cent, while consumer price inflation has risen from 1.9 per cent in January 2019 to 7.4 per cent in a matter of 11 months.

Also, food inflation is at 12.2 per cent. Bank credit is growing 8 per cent with non-food credit rising by 7-8 per cent and credit to industry by just 2.7 per cent. Credit to agriculture has declined from 18.3 per cent to 5.3 per cent and that for MSMEs from 6.7 per cent to 1.6 per cent.

Overall industrial index showed just 0.6 per cent growth. "Every major industry is either near zero or in negative zone," he said, adding thermal power plants are operating at just 55 per cent of the capacity as factories have either closed or are on the verge of closure.

"That gives you a good picture of the state of economy. You don't require MRI," he said. "You are in management for six years. How long can you blame previous managers."

He charged the government with burying unfavourable reports such as the labour survey that put unemployment at 45 -year high of 6.1 per cent at end of 2017-18. Also, consumer expenditure has falling to 3.7 per cent between 2011-12 and 2017-18.

Drilling holes in Budget numbers, he said the 2019-20 budget projected a nominal GDP growth of 12 per cent but ended with just 8.5 per cent. Fiscal deficit was targeted to be shrunk to 3.3 per cent of the GDP but ended by at 3.8 per cent and in the next fiscal it is being targeted at 3.5 per cent.

Revenue deficit was targeted at 2.3 per cent in fiscal ending March 31, 2020 but ended up at 2.4 per cent and in the next it will rise to 2.8 per cent, he said, adding capital expenditure in the next fiscal will shrink to 0.7 per cent from 1.4 per cent in the current.

Net tax revenue in the current fiscal was targeted at Rs 16.49 lakh crore but only Rs 9 lakh crore was collected in first nine months till December 2019 and "you want us to believe this will rise to Rs 15 lakh crore by March 2020," he said.

Similarly, expenditure in 2019-20 was pegged at Rs 27.86 lakh crore but only Rs 11.78 lakh crore spent during April- December and by March this is projected to rise to Rs 27 lakh crore.

"You have no money to spend... and these are masked by numbers," he said. "Numbers are not easily acceptable or believable."

Chidambaram said the government is facing shortfall in all forms of taxes - Rs 1.56 lakh crore on corporate tax, Rs 10,000 crore on personal income tax, Rs 30,000 crore on customs, Rs 52,000 crore on excise and Rs 51,000 crore on GST.

This despite "the extraordinary powers" and "all kinds of power" given to lower level tax officials, he said.

He read of list of heads under which allocation has fallen - food subsidy, agriculture, PM-Kisan, rural roads, mid-day meal scheme, ICDS, skill development, Ayushman Bharat, rural development and MGNEGA.