KT Irfan first Indian athlete to qualify for Tokyo 2020

New Delhi, May 31: India registered its highest single-day spike of COVID-19 cases on Sunday with 8,380 new infections reported in the last 24 hours, taking the country's tally to 1,82,143, while the death toll rose to 5,164, according to the Union Health Ministry.

The number of active COVID-19 cases stood to 89,995, while 86,983 people have recovered and one patient has migrated, it said.

"Thus, around 47.75 per cent patients have recovered so far," a senior health ministry official said.

The total confirmed cases include foreigners.

The death toll has gone up by 193 since Saturday morning, of which 99 were from Maharashtra, 27 from Gujarat, 18 from Delhi, nine each from Madhya Pradesh and Rajasthan, seven from West Bengal, six each from Tamil Nadu and Telangana, five in Bihar, three from Uttar Pradesh, two from Punjab, and one each from Haryana and Kerala.

Kuala Lampur, Jan 9: Saina Nehwal and reigning world champion P V Sindhu produced dominating performances to progress to the women's singles quarterfinals of the Malaysia Masters Super 500 badminton tournament here on Thursday.

Sixth seed Sindhu notched up a commanding 21-10 21-15 victory over Japan's Aya Ohori in a pre-quarterfinal match lasting just 34 minutes. It was Sindhu's ninth successive win over Ohori.

The 24-year-old Indian, who won the World Championships in Basel last year, will take on world number 1 Tai Tzu Ying in the quarterfinals after the Chinese Taipei shuttler got the better of South Korea's Sung Ji Hyun 21-18 16-21 21-10.

Saina, who had won the Indonesia Masters last year before going through a rough patch, dispatched eight seed An Se Young of South Korea 25-23 21-12 after a thrilling 39-minute contest to make the last eight.

This is Saina's first win over the South Korean, who got the better of the Indian in the quarterfinals of the French Open last year.

The two-time Commonwealth Games champion will next take on Olympic champion Carolina Marin.

Saina had defeated Lianne Tan of Belgium 21-15 21-17 in the opening round on Wednesday.

In the men's singles, India's challenge ended after both Sameer Verma and HS Prannoy crashed out in the second round.

While Verma lost to Malaysia's Lee Zii Jia 19-21 20-22, Prannoy was shown the door by top seed Kento Momota of Japan 14-21 16-21.

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.