Saudi Arabia suspends entry for pilgrims over coronavirus

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, Feb 4: Uttar Pradesh Chief Minister Yogi Adityanath on Monday accused Arvind Kejriwal of having a "partnership" with Pakistan and appealed to the people in Delhi to not vote for the AAP chief as it will make Pakistan happy.

Ramping up his attack on the Shaheen Bagh protest, Adityanath said that the protest against the Citizenship Amendment Act (CAA) is merely an excuse for people to vent their anger against the scrapping of Article 370.

"You must have seen their partnership on 370. Arvind Kejriwal used to speak in the same voice as Imran Khan on Article 370. You must have heard it.

"Now when elections are taking place in Delhi, who is speaking in favour of Arvind Kejriwal? It is the ministers of Pakistan. They are aware that Kejriwal is feeding 'biryani to protesters at Shaheen Bagh'," he said, referring to Pakistan minister Fawad Chaudhry's tweet asking Indians to defeat Prime Minister Narendra Modi.

Adityanath addressed three rallies on Monday in the national capital ahead of assembly elections.

"Will Pakistan decide who Indians should vote for. If voting for Kejriwal will make Pakistan happy, should it be done," he asked at a rally in Mehrauli.

Adityanath said his Delhi counterpart Kejriwal has become a "toy in the hands of anti-social and anti-India elements".

Addressing a rally in Vikaspuri in west Delhi, he said that Kejriwal is not bothered about key issues such as providing clean drinking water but is concerned about Shaheen Bagh, the anti-citizenship amendment act protest site.

At another rally in Uttam Nagar in west Delhi, Adityanath said Kejriwal has played with the emotions of the people of Delhi for the last five years.

"He obstructed the development of Delhi. And knowingly and unknowingly, he became a toy in the hands of anti-social and anti-India elements," Adityanath said.

The protest at Shaheen Bagh, he said, has disrupted traffic across the capital.

"A guest with an appointment to meet him at 9.30 am could only reach at 11. He told me he had left as early as 7 am but got stuck because of the traffic in Shaheen Bagh," he said.

The Uttar Pradesh chief minister also slammed Kejriwal for "sympathising" with elements who he said gave anti-India slogans in Jawaharlal Nehru University.

New Delhi, Mar 23: The total number of COVID-19 cases in the country rose to 390 on Monday after 30 fresh cases were reported.

The figure includes 41 foreign nationals and the seven deaths reported so far.

Gujarat, Bihar and Maharahstra reported a death each on Sunday, while four fatalities were reported earlier from Karnataka, Delhi, Maharashtra and Punjab, the Union Health Ministry said.

The total number of active COVID-19 cases across the country now stands at 359, while 24 people have been cured/discharged/migrated.