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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, Jun 29: India recorded 19,459 new coronavirus cases and 380 deaths in the last 24 hours.

According to the Ministry of Health and Family Welfare on Monday, the total coronavirus cases in the country stands at 5,48,318 including 2,10,120 active cases, 3,21,723 cured/discharged/migrated and 16,475 deaths.

Maharashtra's COVID-19 count touched 1,64,626 and cases in Delhi have reached 83,077.

The total number of samples tested up to 28 June is 83,98,362 of which 1,70,560 samples were tested yesterday, as per the data provided by the Indian Council of Medical Research (ICMR). 

Feb 1: The Congress on Saturday expressed hope that the Union Budget would provide relief to the salaried class through tax cuts and invest in rural India besides providing a healing touch to the common man and industry facing “hardship” since demonetisation.

Congress chief spokesperson Randeep Surjewala said the last budget led to crashing consumption levels, soaring unemployment and falling GDP. “Budget 2019= Consumption crashed, Unemployment soared, Farm distress surged, Incomes declined, Investments slumped, Public spending fell, GDP nose dived!,” Surjewala tweeted. “Yet, Modiji gave Corporate Tax Cuts of Rs 1,45,000 crore. Let Budget 2020 give tax cuts to Salaried Class and invest in Rural India,” he said

Rajasthan Chief Minister Ashok Gehlot hoped the budget fulfils expectations of the common people. “Budget 2020 is the time for NDA government to provide a healing touch to common people and industries facing hardships since noteban. Hope the budget fulfils expectations of common people and provide relief across sections,” Gehlot said.