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Geneva, Jun 22: The global count of coronavirus cases has surpassed 8.7 million, with 183,020 new cases recorded on Sunday, the World Health Organisation said in its daily situation report.

Over the last 24 hours, 4,743 people died from COVID-19 worldwide, taking the death toll to 461,715 fatalities, according to the report.

The cumulative global toll of confirmed cases has now reached 8,708,008, as stated in the report.

The WHO Regional Director for Europe, Dr Hans Henri P. Kluge, shared that Europe accounts for 31 per cent of COVID-19 cases and 43 per cent of COVID-19 deaths globally.

Dr Kluge highlighted that several countries continue to face increasing disease incidence and that "preparing for the autumn is a priority now at the WHO Regional Office for Europe"

The United States continues to be worst affected by the contagion with the highest count of cases and fatalities -- 2.2 million and 118,895, respectively.

The novel coronavirus was declared a pandemic by WHO on March 11.

New Delhi, Apr 15: Indian cricket team head coach Ravi Shastri on Wednesday urged people to beat coronavirus by staying at home and by maintaining social distancing. He termed the virus 'mother of all World Cups' and asked people to combat this disease together and win the World Cup of humanity.

Taking to Twitter, Shastri shared a video post where he cited cricket examples to aware people about the seriousness of the COVID-19 pandemic. "As I would know, sports teaches you life lessons that can be applied to just about anything you want to pursue in rest of your life.

Today the COVID-19 has put us in a situation where we got our backs to the wall. To combat this coronavirus is like chasing a World Cup where you give your everything in trying to win it. What's staring you at the face is no ordinary World Cup. This is the mother of all World Cups where not just eleven are playing but 1.4 billion are in the playing arena and competing. Guys we can win this. For that, we have to observe the basics. You have got your Prime Minister leading from the front ahead of the curve like other countries have farmed out," Shastri said.

"You have to obey the orders that come from the top: be it centre, state or the frontline workers who are risking their lives. Two orders that stand out: staying home and maintaining social distancing. It is not easy but to win the game you got to go through the pain to break the chain and see the gain. Come on, guys! let's do it together. Let us get out there in a bruit force of 1.4 billion and beat this corona and get your hands on the World Cup of humanity. Let's do it," he added.

With 1,076 new COVID-19 cases reported in the last 24 hours, India's tally of coronavirus cases has risen to 11,439, said the Union Ministry of Health and Family Welfare on Wednesday.

Out of the total tally, 9,756 cases are active while 1,306 patients have been cured/discharged and migrated. With 38 new deaths reported in the last 24 hours, the death toll rises to 377.

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.