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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.