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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.

An Indian national was killed and four others injured in alleged firing by Nepal police personnel along the India-Nepal border in Bihar's Sitamarhi district today.

Sources said the firing took place after a clash between the Indians and personnel of Nepal police at the Lalbandi-Janki Nagar border in Pipra Parsain panchayat under Sonebarsha police station of the district.

Jitendra Kumar, the additional director general of police (headquarters), confirmed the death and injuries. The place of firing falls under Nepal jurisdiction.

Locals said Vikesh Kumar Rai, 25, died on the spot and Umesh Ram and Uday Thakur received bullet injuries when they were working in an agricultural field. Another person, Lagan Rai, is said to have been detained by the Nepali police.

Injured persons were rushed to Sitamarhi Sadar Hospital for better treatment.

Vikesh Kumar Rai’s father, Nageshwar Rai, said that his agriculture land falls under Narayanpur in Nepal where his son was working.

On May 17, Nepal police had fired blank rounds to disperse dozens of Indians trying to cross the border. It was not clear if they were also farmers.

The district magistrate and the superintendent of police of Sitamarhi have rushed to the spot.

Nepal shares a 1,850-kilometre (1,150-mile) open border with India and people travel across it for work and to visit family. It had closed its international borders on March 22 amid the coronavirus pandemic.

New Delhi, Jan 8: Jawaharlal Nehru University Students Union (JNUSU) President Aishe Ghosh has filed a complaint over the violence that took place at the varsity campus on Sunday.

"I am filing this complaint for the incident in which a mob conspired and acted with common intention to assault, intimidate and attempt to murder me, and request you to register an FIR and apprehend culprits at the earliest," the complaint read.

She said that on January 5, in the afternoon, she received information from students in the campus that some students affiliated to ABVP along with other unidentified men and women had gathered with weapons like rods, sledgehammers and lathis near Ganga Bus Stop.

"I along with Nikhil Mathew (MA Labour Studies) who was also present there, were surrounded by a group of persons of that mob most of whom were wearing masks. The mob of 20-30 persons dragged me behind a car standing near the 24*7 and surrounded me and despite my pleading did not let me go and attacked me with rods while I had fallen down. I remember that one of the people was of medium height wearing a brownish-red sweatshirt with UCLA written on it. I saw his face as he was facing me and did not have a mask on and can identify him if I see him," Ghosh wrote in her complaint.

"I was attacked by the above-mentioned persons collectively and was hit on the head multiple times with iron rods. I fell to the ground and my head started bleeding, and some of them kicked me and hit me with the rod on my hand and rest of the body including my head, chest and back."

"I am attaching with this complaint a copy of the MLC which details my injuries. Nikhil Mathew tried to save me but was also hit with an iron hammer and other weapons on his head and arms. The intention of the group of men and their acts was definitely to murder me and other persons associated with me," she said.