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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, Mar 19: Former Chief Justice of India Ranjan Gogoi took oath as Rajya Sabha MP on Thursday.

Gogoi's wife Rupanjali Gogoi, daughter, and son in law were also present in Parliament.

Congress staged a walkout from the Rajya Sabha over Gogoi's membership to the House.

Meanwhile, Union Minister Ravishankar Prasad welcomed Gogoi in the Rajya Sabha.

President Ram Nath Kovind had nominated the former CJI to the Rajya Sabha on March 16.

Gogoi served as the 46th Chief Justice of India from October 3, 2018, to November 17, 2019.

On November 9, 2019, a five-judge Bench headed by him had delivered the verdict in the long-pending Ramjanmabhoomi case.

Bengaluru, Jul 15: Karnataka Congress Chief D K Shivakumar on Wednesday urged the Ministers in the state to visit Covid-19 designated hospitals and instil confidence among patients, doctors and medical staff there.

Noting that doctors, nurses and others were doing a great job, Shivakumar said the government has to stand with them and instil confidence in them. Speaking to reporters after visiting Victoria hospital, a major dedicated Covid hospital in the city, he said, "All the Ministers have to go to hospitals and instil confidence in the staff, patients.... they have to remove fear and tell them we will have to live with this (virus), and cannot escape from it."

Shivakumar said he believes that by instilling confidence most part of the diseases can be cured. He lauded doctors, paramedical and other staff working at the Hospital for the sake of patients, putting their own life at risk and appreciated facilities provided there.

During the visit, the state Congress President interacted with patients undergoing treatment for Covid-19, also medical staff and doctors. He said at Victoria hospital patients were allowed to use mobile phones, so that they can speak to family members, which has to an extent instilled confidence among them, and the same has to be replicated across the state.

Not wishing to comment on complaints about the quality of facility and PPE kits provided at the hospital, also alleged misappropriation on part of the government in the purchase of equipment for Covid treatment, Shivakumar said, "....let's see that at Vidhana Soudha (seat of state's legislature)." He said, "this is not the time to talk about corruption and other things, this is not the time for it....instilling confidence among patients, doctors and paramedical staff is important now."