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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, Jun 23: The meeting between Indian Army's 14 Corps Commander Lt Gen Harinder Singh and his Chinese counterpart got over after around 11 hours, sources said.

"Today's meeting between the Corps Commander-level officers of India and China is over. The meeting which started at 11:30 am went on for around 11 hours. More details awaited," sources said.

The meeting started at around 11:30 am at Moldo on the Chinese side of Line of Actual Control (LAC) opposite Chushul to defuse the tensions in Eastern Ladakh sector due to Chinese military build-up, the sources said.

This is the second meeting between the two corps commanders. They had met on June 6 and had agreed to disengage at multiple locations. India had asked the Chinese side to go back to pre-May 4 military positions along the LAC.

The Chinese side had not given any response to the Indian proposal and not even shown intent on the ground to withdraw troops from rear positions where they have amassed over 10,000 troops.

India is also likely to discuss the change in rules of engagement on the LAC where the forces have been empowered to use firearms in extraordinary circumstances, sources had said.

They said India will also ask China to honour the commitment given during June 6 talks to disengage in the Galwan valley completely and other places.

The build-up of Chinese air assets including strategic bombers by the PLA Air Force in fields near Indian territory close to Ladakh is also likely to figure in discussions.

India and China have been involved in talks to ease the ongoing border tensions since last month.

However, last week as many as 20 Indian soldiers lost their lives in the face-off in the Galwan Valley after an attempt by the Chinese troops to unilaterally change the status quo during the de-escalation in eastern Ladakh.

The Indian intercepts have revealed that the Chinese side suffered 43 casualties including dead and seriously injured in the violent clash.

New Delhi, May 17: With the highest-ever spike of close to 5,000 cases in the past 24 hours, the COVID-19 count in India has crossed 90,000 on Sunday.

With an increase of 4,987 COVID-19 cases being reported in the last 24 hours, the count has reached 90,927, according to the Union Ministry of Health and Family Welfare.

The total number of active cases in the country stands at 53,946 today, while 2,872 deaths have been recorded due to the infection so far, with one patient having migrated. 120 deaths were reported in the last 24 hours.

However, on the positive side, close to 4,000 patients have also been cured and discharged in the past 24 hours, taking the tally of cured patients to 34,108.

With 30,706 confirmed cases, Maharashtra remains the worst-affected by the infection in the country.

It is followed by Gujarat and Tamil Nadu, with 10,988 and 10,585 cases, respectively.
The national capital, with 9,333 cases, is also one of the regions which is badly affected by the infection.