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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.

New Delhi, Feb 27: An Indian Air Force aircraft on Thursday evacuated 76 Indians and 36 foreign nationals from the coronavirus-hit Chinese city of Wuhan.

The C-17 Globemaster III transport aircraft was sent to Wuhan on Wednesday and it carried 15 tonnes of medical supplies for coronavirus-affected people in China.

On its return, the aircraft brought back 112 people, including 23 citizens from Bangladesh, six from China, two each from Myanmar and the Maldives and one each from South Africa, the US and Madagascar.

Earlier, India had evacuated around 650 Indians from Wuhan in two Air India flights.

“In all 723 Indian nationals and 43 foreign nationals have been evacuated from Wuhan, China, in these three flights,” the Ministry of External Affairs (MEA) said.

On the medical supplies delivered by India to China, the MEA said they would help augment the country’s efforts to control the coronavirus outbreak which had been declared as a public health emergency by the World Health Organisation.

“The assistance is also a mark of friendship and solidarity from the people of India towards the people of China as the two countries also celebrate 70th anniversary of establishment of diplomatic relations this year,” it said.

Jan 6: India’s Finance Ministry has delivered a challenge to its revenue collectors: meet tax targets despite $20 billion of corporate tax cuts.

Through a video conference on Dec. 16, officials were exhorted to meet the direct tax mop-up target of 13.4 trillion rupees ($187 billion), a government official told reporters. Collection in the eight months to November grew at 5% from a year earlier, against the desired 17%.

The missive shows Prime Minister Narendra Modi’s urgent need to buoy public finances in a slowing economy where April-November tax collections were half the amount budgeted. Authorities withheld some payments to states and have capped ministries’ expenditure as the fiscal deficit ballooned beyond the target.

The government’s efforts to maintain its deficit goal goes against advice from some quarters, including central bank Governor Shaktikanta Das, who urged more spending to spur economic growth.

It’s uncertain though how much room Modi’s administration has to boost expenditure, given that it may already be borrowing as much as 540 billion rupees through state-run companies, a figure that isn’t reflected on the federal balance sheet. Uncertainty about public finances pushed up sovereign yields in November and December, compelling Das to announce unconventional policies to keep costs in check.

“This is not a time to conceal the fiscal deficit by off-budget borrowing or deferring payments,” said Indira Rajaraman, an economist and a former member of the Reserve Bank of India’s board. “If they were to stick to the target, that would be catastrophic because there is so much pump-priming that is needed right now.”

GDP grew 4.5% in the quarter ended September, the slowest pace in more than six years as both consumption and investments cooled in Asia’s third-largest economy. Only government spending supported the expansion, piling pressure on Modi to keep stimulating.

S&P Global Ratings warned in December it may downgrade India’s sovereign ratings if economic growth doesn’t recover. Government support seems to be waning now, with ministries asked to cap spending in the final quarter of the financial year at 25% of the amount budgeted rather than 33% allowed earlier. This new rule will hamstring sectors including agriculture, aviation and coal, where not even half of annual targets have been disbursed.

As the federal government runs short of money, it’s been delaying payouts to state administrations.

Private hospitals have threatened to suspend cash-less services to government employees over non-payment of dues, while a builder informed the stock exchange about delayed rental payments from no less than the tax office itself.

India is considering a litigation-settlement plan that will allow companies to exit lingering tax disputes by paying a portion of the money demanded by the government, the Economic Times newspaper reported Saturday.

The move will help improve the ease of doing business besides unlocking a part of the almost 8 trillion rupees ($111 billion) caught up in these disputes. The step, which is being considered as part of the annual budget, could also bridge India’s fiscal gap.

Finance Minister Nirmala Sitharaman has refused to comment on the deficit goal before the official budget presentation due Feb. 1.

A deviation from target, if any, “will need to be balanced with a credible consolidation plan further-out,” said Radhika Rao, an economist at DBS Group Holdings Ltd. in Singapore.