Murder case eye witness’ tongue chopped off

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.

Kozhikode, Jun 26: A man, who had returned from Bahrain on Thursday and has been under quarantine at his house in Villyapallai near here, has been stabbed on his arm by an unidentified person.

Police sources said the assailant, with a masked face, had ransacked the man's house by break-opening the door at midnight lat night and stabbed Lijeesh on his arm and fled from the scene.

The nearby residents took Lijeesh to a nearby hospital and was put back on quarantine. 

New Delhi, Feb 11: Celebrations broke out at the AAP headquarters here as early vote-counting trends for the Delhi Assembly polls on Tuesday showed a comfortable victory for the Chief Minister Arvind Kejriwal-led party.

The headquarters were decorated with blue and white balloons and big cut-outs of Kejriwal were placed in different parts of the party office.

"We knew it. We have changed the politics of this country. Now it is Delhi, next is India," said Sanjeev Singh, a party volunteer from Hari Nagar.

Another volunteer Fareen Khan said, "We hope we get such a clear majority that a message goes out that doing Hindu-Muslim politics will not work anymore."

The Aam Aadmi Party (AAP) is leading in 26 seats while the BJP is leading in 14 seats, according to early trends by the Election Commission.

According to the EC's website, AAP convenor Kejriwal is leading in his New Delhi constituency.

Kejriwal reached the party office as the counting of votes got underway.

Counting centres are spread across 21 locations, spanning 70 constituencies.

Polling for the 70-member Delhi Assembly was held on Saturday.