Shambhulal Regar, who lynched Muslim man, all set to contest 2019 polls

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.

Miami, Mar 12: The NBA has suspended its season "until further notice" after a Utah Jazz player tested positive Wednesday for the coronavirus, a move that came only hours after the majority of the league's owners were leaning toward playing games without fans in arenas.

Now there will be no games at all, at least for the time being. A person with knowledge of the situation said the Jazz player who tested positive was center Rudy Gobert. The person spoke to The Associated Press on condition of anonymity because neither the league nor the team confirmed the test.

"The NBA is suspending game play following the conclusion of tonight's schedule of games until further notice,'' the league said in a statement sent shortly after 9:30 p.m. EDT. "The NBA will use this hiatus to determine next steps for moving forward in regard to the coronavirus pandemic.''

The test result, the NBA said, was reported shortly before the scheduled tip-off time for the Utah at Oklahoma City game on Wednesday night was called off. Players were on the floor for warmups and tip-off was moments away when they were told to return to their locker rooms. About 30 minutes later, fans were told the game was postponed ``due to unforeseen circumstances."

Shutdown for two weeks?

Those circumstances were the league's worst-case scenario for now -- a player testing positive. A second person who spoke to AP on condition of anonymity said the league expects the shutdown to last a minimum of two weeks, but cautioned that time-frame is very fluid.

"It's a very serious time right now," Miami Heat coach Erik Spoelstra said. "I think the league moved appropriately and prudently and we'll all just have to monitor the situation and see where it goes from here."

The Jazz released a statement saying a player -- they did not identify Gobert -- tested negative earlier Wednesday for flu, strep throat and an upper respiratory infection. That player's symptoms diminished as the day went along, but the decision was made to test for COVID-19 anyway. That test came back with a preliminary positive result.

"The individual is currently in the care of health officials in Oklahoma City," the Jazz said, adding that updates would come as appropriate.

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.