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London, May 20: The current physical distancing guidelines of 6 feet may be insufficient to prevent COVID-19 transmission, according to a study which says a mild cough in low wind speeds can propel saliva droplets by as much as 18 feet.

Researchers, including those from the University of Nicosia in Cyprus, said a good baseline for studying the airborne transmission of viruses, like the one behind the COVID-19 pandemic, is a deeper understanding of how particles travel through the air when people cough.

In the study, published in the journal Physics of Fluids, they said even with a slight breeze of about four kilometres per hour (kph), saliva travels 18 feet in 5 seconds.

"The droplet cloud will affect both adults and children of different heights," said study co-author Dimitris Drikakis from the University of Nicosia.

According to the scientists, shorter adults and children could be at higher risk if they are located within the trajectory of the saliva droplets.

They said saliva is a complex fluid, which travels suspended in a bulk of surrounding air released by a cough, adding that many factors affect how saliva droplets travel in the air.

These factors, the study noted, include the size and number of droplets, how they interact with one another and the surrounding air as they disperse and evaporate, how heat and mass are transferred, and the humidity and temperature of the surrounding air.

In the study, the scientists created a computer simulation to examine the state of every saliva droplet moving through the air in front of a coughing person.

The model considered the effects of humidity, dispersion force, interactions of molecules of saliva and air, and how the droplets change from liquid to vapour and evaporate, along with a grid representing the space in front of a coughing person.

Each grid, the scientists said, holds information about variables like pressure, fluid velocity, temperature, droplet mass, and droplet position.

The study analysed the fates of nearly 1,008 simulated saliva droplets, and solved as many as 3.7 million equations.

"The purpose of the mathematical modelling and simulation is to take into account all the real coupling or interaction mechanisms that may take place between the main bulk fluid flow and the saliva droplets, and between the saliva droplets themselves," explained Talib Dbouk, another co-author of the study.

However, the researchers added that further studies are needed to determine the effect of ground surface temperature on the behaviour of saliva in air.

They also believe that indoor environments, especially ones with air conditioning, may significantly affect the particle movement through air.

This work is important since it concerns safety distance guidelines, and advances the understanding of the transmission of airborne diseases, Drikakis said.

Washington, May 20: Once dubbed as historic by him, US President Donald Trump on Tuesday said he now feels ‘differently’ about the trade deal he signed with China earlier this year.

He said this while once again venting out his frustration with the Beijing leadership, accusing it of letting coronavirus spread.

Till Tuesday, over 92,000 Americans have died and 1.5 million tested positive for coronavirus that has globally killed around 320,000 people.

The US and China had signed a deal in January to end their 22-month-long trade war during which the two countries slapped tit-for-tat tariff hikes on products worth nearly half a trillion USD.

Under it, Beijing agreed to increase its purchase of US goods by USD 200 billion in 2020-2021.

“I feel differently now about that deal than I did three months ago,” Trump told reporters during a Cabinet meeting at the White House.

“We will see what all happens, but it's been a very disappointing situation. A very disappointing thing happened with China because the plague flowed in and that wasn't supposed to happen and it could have been stopped," he said.

Trump said he was very excited when the trade deal with China was signed.

“But once the virus came in, once the plague, as I called it, came in, I said how did they let that happen? And how come it didn't go into other sections of China? Why did they block it from leaving Wuhan? But they didn't block it from going to the rest of the world, including the United States. Why is that? Beijing doesn't have it. Other places don't have it,” he said.

Trump did not respond to questions on retaliation against China.

Meanwhile, top American senators continued to press the administration that rules of engagement with China needs to change post-coronavirus.

“As we know, they unleashed this virus on America and the world with their classic communist cover-up, deception, continued propaganda campaign, costing now over 90,000 American lives, 35 million Americans losing their jobs so far,” Senator Martha McSally said during a Congressional hearing.

“We don’t know who patient zero is, they destroyed samples, they silenced doctors, they kicked out journalists, they impacted international travel to seed this and their reckless behaviour continues to be the root of all this,” she said.

As a result of coronavirus, the American economy has been thrown into recession; more than 36 million people have lost their job – the worst ever after last century’s great depression.

Many of the US states have now started opening up, after taking necessary precautions.

By conservative estimates, it will take several quarters for the economy to be back on track.

Trump in the last a few weeks has exuded confidence that the economy will be back on track next year.

New Delhi, Mar 6: Shares of YES Bank and State Bank of India came under huge selling pressure on Friday as developments unfolded regarding SBI picking stake in the private lender. Shares of the lender hit record low of Rs 5.55, plunging 85 per cent, and were trading below its previous low of Rs 8.16 hit on March 9, 2009.

SBI, on the other hand, slumped 11 per cent to Rs 257.35 on the BSE. The benchmark S&P BSE Sensex was trading with a cut of over 3 per cent at 37,251.37 level.

In the past three months, share price of the private lender has plunged 41 per cent, while the state-owned lender has slipped 14 per cent. In comparison, the S&P BSE Sensex has dipped 5.6 per cent till Thursday.

On Thursday, the Reserve Bank of India superseded the board of troubled private sector lender YES Bank and imposed a 30-day moratorium on it “in the absence of a credible revival plan” amid a “serious deterioration” in its financial health.

During the moratorium, which came into effect from 6 pm on Thursday, YES Bank will not be allowed to grant or renew any loans, and “incur any liability”, except for payment towards employees’ salaries, rent, taxes and legal expenses, among others.

This is the first time that a bank of this size will be put under a moratorium by the RBI.

“The financial position of YES Bank had undergone a steady decline “largely due to inability of the bank to raise capital to address potential loan losses and resultant downgrades, triggering invocation of bond covenants by investors, and withdrawal of deposits,” RBI said in a statement.

“After the moratorium, the next step will be to infuse to money and keep the bank afloat. So from shareholders’ point of view, the future is certainly hazy as the capital requirement is huge. The good part, however, is that the RBI has stepped in and depositors don't have to worry,” says Siddharth Purohit, a research analyst at SMC Securities.

Meanwhile, analysts at Nomura believe that placing the Bank under moratorium implies that equity value in the bank would be negligible, and that the chances of private capital participating in future capital raising plan are near zero.

"Any resolution for Yes Bank is more proposed from the perspective of deposit holders and systemic stability, and not from the perspective of Yes Bank equity investors or even perpetual bond holders," they wrote in a note dated March 6.

In another development, SBI’s Board Thursday gave in-principle approval to consider an “investment opportunity” in YES Bank, even as it said “no decision had yet been taken to pick up stake in the bank”.

According to a  report, highly-placed sources indicated a rescue plan involving SBI and Life Insurance Corporation of India (LIC) was being discussed and an announcement in this regard might be made soon.

“While the finer details of the deal are being worked out, it is anticipated that both SBI and LIC together will take a 51 per cent stake in the bank, with a one-year lock-in period,” the report said.

Most analysts believe it is a positive step for the Indian financial sector as the government has tried to avoid a repeat of IL&FS-like crisis.

“The move is a positive step for the financial sector as a whole. By this, the government has tried to avoid a repeat of IL&FS-like crisis and has saved the depositors,” said AK Prabhakar, Head of Research at IDBI Capital. While we know that YES Bank has a huge pile of bad loans, SBI is the only bank that has the capacity to absorb it, he added.

However, the valuation at which YES bank would be taken over remains a cause of concern.

Global brokerage firm JP Morgan Thursday cut its target price for YES Bank on Thursday to Rs 1 per share, taking into account the potential fall in the lender’s net worth due to stressed assets.

“We believe forced bailout investors will likely want the bank to be acquired at near-zero value to account for risks associated with the stress book and likely loss of deposits. We think the bank will need to be recapitalised at nominal equity value and could test dilution of additional tier 1 (AT1) capital. We remain underweight and cut our target price to Rs 1 as we believe net worth is largely impaired,” JP Morgan said in a note.

Global brokerage firm Nomura estimates a need of Rs 25,000-44,000 crore and adjusted for Rs 7,400 crore of current coverage, if the current stress of Rs 65,000-70,000 crore faces 70 per cent loss given default (LGD).

"It implies Rs 18,000-37,000 crore needed for provisioning against the current net worth of Rs 25,700 crore Also, to run as going concern, the bank would require over Rs 20,000 crore of CET-1 capital as well," the note said.

YES Bank has registered slippages of Rs 12,000 crore so far in FY20, while it has placed Rs 30,000 crore of loan assets under the watch list. Its deposits stood at Rs 2.09 trillion on September 30, 2019, while its advances totalled Rs 2.24 trillion. The bank has delayed publishing its December quarter results by a month to March 14.