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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.

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.

Riyadh, Feb 27: Saudi Arabia on Thursday halted travel to the holiest sites in Islam over fears about a new viral epidemic just months ahead of the annual hajj pilgrimage, a move coming as the Mideast has over 220 confirmed cases of the illness.

The extraordinary decision by Saudi Arabia stops foreigners from reaching the holy city of Mecca and the Kaaba, the cube-shaped structure the world's 1.8 billion Muslims pray toward five times a day. It also said travel was suspended to Prophet Muhammad's mosque in Medina.

The decision showed the worry about the outbreak potentially spreading into Saudi Arabia, whose oil-rich monarchy stakes its legitimacy on protecting Islam's holy sites. The epicenter in the Mideast's most-affected country, Iran, appears to be in the holy Shiite city of Qom, where a shrine there sees the faithful reach out to kiss and touch it in reverence.

"Saudi Arabia renews its support for all international measures to limit the spread of this virus, and urges its citizens to exercise caution before traveling to countries experiencing coronavirus outbreaks," the Saudi Foreign Ministry said in a statement announcing the decision.

"We ask God Almighty to spare all humanity from all harm." Disease outbreaks always have been a concern surrounding the hajj, required of all able-bodied Muslims once in their life, especially as pilgrims come from all over the world.

The earliest recorded outbreak came in 632 as pilgrims fought off malaria. A cholera outbreak in 1821, for instance, killed an estimated 20,000 pilgrims. Another cholera outbreak in 1865 killed 15,000 pilgrims and then spread worldwide.

More recently, Saudi Arabia faced a danger from a related coronavirus that caused Middle East respiratory syndrome, or MERS. The kingdom increased its public health measures in 2012 and 2013, though no outbreak occurred.

While millions attend the 10-day hajj, this year set for late July into early August, millions more come during the rest of the year to the holy sites in the kingdom.

"It is unprecedented, at least in recent times, but given the worldwide spread of the virus and the global nature of the umrah, it makes sense from a public health and safety point of view," said Kristian Ulrichsen, a research fellow at the James A Baker III Institute for Public Policy at Rice University. "Especially since the Iranian example illustrates how a religious crossroads can so quickly amplify the spread and reach of the virus." The virus that causes the illness named COVID-19 has infected more than 80,000 people globally, mainly in China. The hardest-hit nation in the Mideast is Iran, where Health Ministry spokesman Kianoush Jahanpour said 19 people have died among 139 confirmed cases.

Experts are concerned Iran may be underreporting cases and deaths, given the illness's rapid spread from Iran across the Persian Gulf. For example, Iran still has not confirmed any cases in Mashhad, even though a number of cases reported in Kuwait are linked to the Iranian city.

In Bahrain, which confirmed 33 cases as of Thursday morning, authorities halted all flights to Iraq and Lebanon. It separately extended a 48-hour ban overflights from Dubai and Sharjah in the United Arab Emirates, through which infected travellers reached the island kingdom off the coast of Saudi Arabia.

Iranian President Hassan Rouhani said there were no immediate plans to quarantine cities but acknowledged it may take "one, two or three weeks” to get control of the virus in Iran.

As Iran's 80 million people find themselves increasingly isolated in the region by the outbreak, the country's sanctions-battered economy saw its currency slump to its lowest level against the US dollar in a year on Wednesday.