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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.

New Delhi, Jan 20: The BJP has got a brand new President in the form of JP Nadda. At around 2.30 pm, the announcement was made, bringing an end to the Amit Shah era in BJP. The party's Working President Jagat Prakash Nadda won unopposed, sparking celebrations outside the BJP headquarters here on Monday. 

Amit Shah himself was among the people who proposed Nadda's name along with Nitin Gadkari and Rajnath Singh. Soon after his annointment, BJP election returning officer Radha Mohan Singh told the media, "I announce JP Nadda as the new BJP President." Shah was also seen hugging Nadda.

The nomination process for the post of the BJP President began at 10 am and went on till 12.30 pm. For the next hour, the filed nomination paper, which was just one, was examined. Party members waitied till 2.30 pm for the candidate to withdraw if he wished to. It was after this that Nadda was declared as the man who would step into the shoes of Amit Shah.

Many in the BJP believe that although Nadda is the BJP chief now, Shah would still make all macro-level decisions like pre poll alliances or top organisational appointments. Nadda would be in charge of monitoring the day-to-day needs of the organisation. BJP sources say that Amit Shah himself wanted an arrangement like this one and personally wanted Nadda to take over. as he helped Shah formulate legislations like Triple Talaq and Citizenship Amendment Act.

The party constitution mandates completion of election of at least 50 per cent of state Presidents for the election of national President to happen. In the last few days, the BJP has completed the election of a slew of state Presidents like in West Bengal, Nagaland among others.

The process of election of the national BJP President is quite elaborate and has been described in detail in the party constitution, which says that the national president shall be elected by an electoral college, comprising members of the national council and the state councils.

"Any 20 members of the electoral college of a state can jointly propose the name of a person, who has been an active member for four terms and has 15 years of membership, for the post of national president. Such joint proposal should come from not less than five states where elections have been completed for the national council. The consent of the candidate is necessary," it says.

Who is JP Nadda?

Jagat Prakash Nadda, 59, who has his roots in the Rashtriya Swayamsevak Sangh (RSS) and its affiliates, was appointed the Bharatiya Janata Party (BJP) national President on Monday, replacing his 'mentor' and Union Home Minister Amit Shah.

Former environment, health and law minister from Himachal Pradesh, which has just four of the Lok Sabha's 543 seats, Nadda has tried to carve out his own space in national politics with his low profile and astute organisational skills, believe his party leaders.

He rose through the ranks from the Akhil Bharatiya Vidyarthi Parishad (ABVP), the student wing of the RSS, from where he has managed to build inroads from university to the state politics.

Nadda has been active on the national political scene since 2010 when he was picked by then BJP chief Nitin Gadkari to join his new team. He was made the party's national general secretary.

Born on December 2, 1960, Nadda did his graduation from Patna and holds a post-graduate degree in political science and Bachelor of Legislative Law (LL.B) from Himachal Pradesh University in Shimla.

Starting his political career as a student leader of the ABVP in 1978, Nadda had also worked both with Gadkari and Shah even in the party's youth wing -- the Bharatiya Yuva Morcha -- from 1991 to 1994.

His wife Mallika Nadda, who teaches history at the Himachal Pradesh University and is currently posted in university's campus in Delhi, was an ABVP activist too, and its national general secretary from 1988 to 1999.

In the previous BJP government (2007-12) in the state, Nadda was forced to resign as Forest Minister in 2010 owing to differences between him and then chief minister Prem Kumar Dhumal.

He was elected to the Rajya Sabha in 2012.

Nadda won his first Assembly election from Bilaspur (Sadar) in Himachal in 1993. In 1998, he again won from that seat and became the state Health Minister.

He lost the Assembly elections in 2003, but again won in 2007 and was appointed the Forest Minister in the Himachal Pradesh.

Nadda, as a forest minister, was the brain behind opening forest police stations to check forest crimes, launching community-driven plantation, setting up forest ponds and the massive plantation of deodars to boost the depleting green cover of the 'Queen of Hills', as Shimla was fondly called by the British.

A close confidant of Prime Minister Narendra Modi, Nadda was among those who were mentioned as likely aspirants to the BJP top post after Rajnath Singh was inducted into the Central government as the Home Minister in 2014.

Later, Nadda was inducted into the union cabinet in its first expansion in 2014 as the Health Minister.

Hailing Nadda's appointment, Chief Minister Jai Ram Thakur told IANS it is a proud moment that a leader belonging to a small state in the national politics is today the leader of the country's biggest national party.

His father N.L. Nadda, who was a Vice-Chancellor of the Ranchi University, resides in Bilaspur town.

Feb 2: Prime Minister Narendra Modi’s second budget in seven months disappointed investors who were hoping for big-bang stimulus to revive growth in Asia’s third-largest economy.

The fiscal plan -- delivered by Finance Minister Nirmala Sitharaman on Saturday -- proposed tax cuts for individuals and wider deficit targets but failed to provide specific steps to fix a struggling financial sector, improve infrastructure and create jobs. Stocks slumped as a proposal to scrap the dividend distribution tax for companies failed to impress investors.

"Far from being a game changer, the budget provides little in terms of short-term growth stimulus,” said Priyanka Kishore, head of India and South East Asia economics at Oxford Economics Ltd. in Singapore. “While income tax cuts will provide some relief on the consumption front, the multiplier effect is low and the overall stance of the budget is not expansionary."

India has gone from being the world’s fastest-growing major economy three years ago, expanding at 8%, to posting its weakest performance in more than a decade this fiscal year, estimated at 5%.

While the government has taken a number of steps in recent months to spur growth, they’ve fallen short of spurring demand in the consumption-driven economy. Saturday’s budget just added to the glum sentiment.

Okay Budget

“It’s an okay budget but not firing on all cylinders that the market was hoping for,” said Andrew Holland, chief executive officer at Avendus Capital Alternate Strategies in Mumbai.

The government had limited scope for a large stimulus given a huge shortfall in revenues in the current year. The slippage induced Sitharaman to invoke a never-used provision in fiscal laws, allowing the government to exceed the budget gap by 0.5 percentage points. The result: the deficit for the year ending March was widened to 3.8% of gross domestic product from a planned 3.3%.

On Friday, India’s chief economic adviser Krishnamurthy Subramanian said reviving economic growth was an “urgent priority” and deficit goals could be relaxed to achieve that. The adviser’s Economic Survey estimated growth will rebound to 6%-6.5% in the year starting April.

The fiscal gap will narrow to 3.5% next year, as the government budgeted for gross market borrowing to rise marginally to 7.8 trillion rupees from 7.1 trillion rupees in the current year. A plan to earn 2.1 trillion rupees by selling state-owned assets in the year starting April will also help plug the deficit.

Total spending in the coming fiscal year will increase to 30.4 trillion rupees, representing a 13% increase from the current year’s budget, according to latest data.

Key highlights from the budget:

* Tax on annual income up to 1.25 million rupees pared, with riders

* Dividend distribution tax to be levied on investors, instead of companies

* Farm sector budget raised 28%, transport infrastructure gets 7% more

* Spending on education raised 5%

* Fertilizer subsidy cut 10%

Analysts said the muted spending plan to keep the deficit in check will lead to more downside risks to growth in the coming months.

“It is very doubtful that the increase in expenditure will push demand much,” Chakravarthy Rangarajan, former governor at the Reserve Bank of India told BloombergQuint, adding that achieving next year’s budget deficit goal of 3.5% of GDP was doubtful.

With the government sticking to a conservative fiscal path, the focus will now turn to central bank, which is set to review monetary policy on Feb. 6. Given inflation has surged to a five-year high of 7.35%, the RBI is unlikely to lower interest rates.

What Bloomberg’s Economists Say:

The burden of recovery now falls solely on the Reserve Bank of India. With inflation breaching RBI’s target at present, any rate cuts by the central bank are likely to be delayed and contingent upon inflation falling below the upper end of its 2%-6% target range.

-- Abhishek Gupta, India economist

Governor Shaktikanta Das may instead focus on unconventional policy tools such as the Federal Reserve-style Operation Twist -- buying long-end debt while selling short-tenor bonds -- to keep borrowing costs down.