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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.

Panaji, Feb 23: A MiG-29K aircraft crashed off Goa during a routine training sortie on Sunday morning, the Indian Navy said in a statement.

"The pilot ejected safely and has been recovered. An enquiry into the incident has been ordered," the statement said.

On November 16, a MiG-29K trainer flight had crashed after a bird hit, soon after it took off the Dabolim International airport, which functions out of the Indian Navy base INS Hansa.

Both pilots had managed to safely eject themselves to safety after both the engines of their jet failed.

According to data tabled in the recent budget session of the Goa Assembly, every ten days, at least one aircraft landing or taking off at Goa's Dabolim international airport faces dangers involving birds or stray dogs near the runway.

Panaji, Mar 26: Three persons, all with travel history abroad, tested positive for coronavirus in Goa on Wednesday, health department officials said, as the tourist haven joined the states which have reported COVID-19 cases.

This is the first time the tourist state has reported coronavirus positive cases.

The Directorate of Health Services, in a late night press statement here, said three suspected cases of COVID-19 from Goa, whose test results were awaited, have turned out positive.

All three are male patients of ages 25, 29 and 55 years. They have travel history of returning to Goa from Spain, Australia and the USA, respectively, the officials said.

The condition of the trio, admitted in Goa Medical College and Hospital near here, is stable, the officials added.

Chief Minister Pramod Sawant said the state is providing the best healthcare facility to the diagnosed patients.

I have been informed by the state Directorate of Health services that three individuals have been tested positive for #COVID19 in Goa.

"We are providing the best healthcare facility to the diagnosed patients, he said.

Their condition is stable at present. e have also traced their contacts and are quarantining them, Sawant added.

Health Minister Vishwajit Rane said the government is taking all precautions and following guidelines related to the viral infection.

In view of the three positive coronavirus cases in Goa, we are following all guidelines laid down by the central government and taking all precautions with the support of chief minister Pramod Sawant, he said.

Our testing facility will be up and running in the next two days. Our team of doctors is doing its est to make sure we contain the spread of virus in the state, Rane added.