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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, April 6: On the 40th foundation day of the Bharatiya Janata Party (BJP) today, Prime Minister Narendra Modi appealed to party workers to reaffirm the importance of social distancing, help those in need amid lockdown and enable India to overcome COVID-19.

"Greetings to all fellow BJP Karyakartas on the Sthapana Diwas of the party. Tributes to all those who have toiled hard to build the party for decades, due to which BJP has got the opportunity to serve crores of Indians across our nation's length and breadth. #BJPat40," Prime Minister Modi tweeted.

"Whenever BJP has got the opportunity to serve, the party has focused on good governance and empowering the poor. In line with the party's ethos, our Karyakartas have worked hard to bring a positive difference in the lives of many and done great social service.

We mark our party's 40th anniversary when India is battling COVID-19. I appeal to BJP Karyakartas to follow the set of guidelines from our party president JP Nadda Ji, help those in need and reaffirm the importance of social distancing. Let's make India COVID-19 free," he added.

Earlier, in a message, party President JP Nadda had asked BJP workers to hoist new party flag at all offices and at every karyakarta's house. "Maintain social distancing while hoisting," the BJP President stated.

"All BJP Karyakartas to give up one meal on our Foundation Day as a way to show solidarity with people facing hardships during the lockdown.

Provide food packets to 5+1 needy under #FeedtheNeedy program. In the next one week, put a system in place where we can provide two homemade face covers to each person at our booth. We should circulate videos of preparation and distribution of such face covers with #WearFaceCoverStaySafe," Nadda stated.

He also asked BJP Kartyakartas to encourage 40 others to donate Rs 100 each to PM-CARES Fund.

Mumbai, May 22: The Reserve Bank of India (RBI) on Friday reduced repo rate by 40 basis points to 4 per cent in an effort to further boost liquidity in the economy which has been reeling under the impact of COVID-19 induced countrywide lockdown.

As a result, the reverse repo rate stands at 3.35 per cent, said RBI Governor Shaktikanta Das. The six-member monetary policy committee (MPC) voted 5:1 in favour of the decision.

Repo rate is the rate at which a country's central bank lends money to commercial banks, and the reverse repo rate is the rate at which it borrows from them.