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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.

Mar 21: India’s economy, already in the grip of a slowdown, is in for more pain after Prime Minister Narendra Modi appealed to citizens to stay at and work from home to curb the coronavirus outbreak.

The services sector, which accounts for about 55% of India’s gross domestic product, is poised to be the worst hit after Modi, in a late evening address on Thursday, urged citizens to go on a self-imposed curfew for a day and private companies to allow employees to work from home for longer. In the country’s vast informal sector, social-distancing measures could mean a dent to productivity and consumption because of job or pay losses.

“The impact of a partial lock-down or social distancing will be significant,” said Rahul Bajoria, a senior economist at Barclays Plc in Mumbai. “If there’s a widespread community outbreak, GDP could fall as low as 3.5% in the year starting April 1.”

Shrinking output may limit growth in an economy that’s already set to expand at an 11-year low of 5% in the current year to March 31. Before the virus outbreak, India had forecast growth to recover to 6%-6.5% in the next fiscal year. S&P Global Ratings and Fitch Ratings have already slashed their growth forecast by 50 basis points.

“The current social-distancing measures will severely impact airlines, hotels, malls, multiplexes, restaurants and retailers,” according to analysts at Crisil Ltd., the local unit of S&P Global. “Lower footfalls and occupancies, decline in business volume and sub-optimal operating efficiencies will impact cash flows of companies in these sectors,” wrote the analysts led by Chief Economist Dharmakirti Joshi.

The government will try to announce a relief package for virus-affected sectors as early as possible, Finance Minister Nirmala Sitharaman said Friday.

In a televised address, Modi advised all citizens to stay at home for a day on March 22, as he sought to stem the spread of the coronavirus -- cases of which are relatively low in India at about 200, compared with more than 200,000 infected people globally. His government also barred incoming flights for a week from that day, joining a growing list of countries effectively sealing their borders.

What Bloomberg’s Economists Say

We had only earlier this week lowered our GDP outlook to consider the direct impact of the local outbreak as confirmed virus cases exceeded 100 as of March 15 and the federal and state governments announced social distancing measures that have already started to crimp economic activity. We are now revising down our GDP estimate for 4Q fiscal 2020 to 3.3%, from our 3.5%.

-- Abhishek Gupta, India economist

For more, click here

“Consumption being the biggest component of GDP, a lock-down is bound to have a big impact on the economy,” said Devendra Kumar Pant, chief economist at India Ratings and Research, the local unit of Fitch. “Modeling uncertainty in any system will be very difficult, but one can say the slowdown could deepen or prolong further.”

Work From Home

While companies, including billionaire Mukesh Ambani-controlled Reliance Industries Ltd., are asking employees to work from home, the option isn’t feasible in India’s vast informal sector.

“The option to work remotely simply won’t exist for most,” said Shilan Shah, an economist with Capital Economics Pte. in Singapore.

As many households don’t have savings buffers, the government would probably have to back this up with large-scale cash handouts that reach the poorest, he said.

Work from home is posing implementation challenges for the manufacturing sector where workers are required to be physically present at the production sites. The services sector, such as banking and information technology, also needs employees to be present in offices as confidential data is used, according to industry group Federation of Indian Chambers of Commerce and Industry.

Jan 23: Pakistan's Prime Minister Imran Khan called on Wednesday for the United Nations to help mediate between nuclear armed India and Pakistan over the disputed territory of Kashmir.

"This is a potential flashpoint," Khan said during a media briefing at the annual meeting of the World Economic Forum in Davos, Switzerland, adding that it was time for the "international institutions ... specifically set up to stop this" to "come into action".

The Indian government in August revoked the constitutional autonomy of Indian-administered Kashmir, splitting the Muslim-majority region into two federal territories in a bid to integrate it fully with the rest of the country.

Kashmir is claimed in full by both India and Pakistan. The two countries have gone to war twice over it, and both rule parts of it. India's portion has been plagued by separatist violence since the late 1980s.

Khan said his biggest fear was how New Delhi would respond to ongoing protests in India over a citizenship law that many feel targets Muslims.

"We're not close to a conflict right now ... What if the protests get worse in India, and to distract attention from that, what if ..."

The prime minister said he had discussed the prospect of war between his country and India in a Tuesday meeting with US President Donald Trump. Trump later said he had offered to help mediate between the two countries.

Khan said Pakistan and the United States were closer in their approach to the Taliban armed rebellion in Afghanistan than they had been for many years. He said he had never seen a military solution to that conflict.

"Finally the position of the US is there should be negotiations and a peace plan."

In a separate on-stage conversation later on Wednesday, Khan said he had told Trump in their meeting that a war with Iran would be "a disaster for the world". Trump had not responded, Khan said.

Khan made some of his most straightforward comments when asked why Pakistan has been muted in defence of Uighurs in China.

China has been widely condemned for setting up complexes in remote Xinjiang province that Beijing describes as "vocational training centres" to stamp out ""extremism and give people new skills.

The United Nations says at least one million ethnic Uighurs and other Muslims have been detained.

When pressed on China's policies, Khan said Pakistan's relations with Beijing were too important for him to speak out publicly.

"China has helped us when we were at rock bottom. We are really grateful to the Chinese government, so we have decided that any issues we have had with China we will handle privately."