Editor, TV channel head arrested over defermatory content against Adityanath

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.

Mumbai, Jan 30: The Shiv Sena on Thursday endorsed Union home minister Amit Shah's view that alleged inflammatory statements made by Sharjeel Imam, an anti- Citizenship (Amendment) Act (CAA) activist, were dangerous.

No politics should be done on the issue, and such "pest" afflicting the country should be finished off, it said.

Imam was arrested on Tuesday in connection with his speeches at Jamia Millia Islamia University in Delhi and in Aligarh during anti-CAA protests.

He has been booked for sedition, among other offences.

In an editorial published in its mouthpiece `Saamana', the Sena, a former ally of the BJP, said, "We agree with union home minister's comments that Sharjeel Imam's alleged words of separation are more dangerous than that of Kanhaiya Kumar."

Kumar, former student leader from Jawaharlal Nehru University, had been arrested over alleged separatist slogans shouted during a protest on varsity campus.

The Sena, which has formed alliance with the Congress and NCP to come to power in Maharashtra, is often seen walking a tightrope to preserve its credentials as a pro-Hindutva party.

"The union home ministry, while initiating action against Imam, should not indulge in politics and try to finish off this pest that is afflicting our country," the editorial said.

"One must find out why such language of breaking up this country into pieces is being used by the educated youth of this country more and more frequently. Who is spewing such venom into the mind of Sharjeel who did his graduation from IIT-B and now pursuing PhD from JNU?" the Sena asked.

"Even people involved in Elgar Parishad at Pune are facing sedition charges and these people have been known as intellectuals and are well-known personalities," said the party.

"A conspiracy to bring about a conflict between Hindus and Muslims and ensure continuance of anarchy and civil war as in Iraq and Afghanistan exists. The boost for such activities is coming from a 'political laboratory'," the editorial said.