M M Akbar arrested in Hyderabad en-route to Qatar; likely to be grilled by Kerala police

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.

Bengaluru, Jun 16: A woman employee at the Vikasa Soudha, next to Vidhana Soudha, the State Secretariat, was tested positive for COVID-19 on Tuesday.

Hence the authorities sealed the Food Department offices, which was in the ground floor of the building.

Employees of Vidhana Soudha and Vikasa Soudha were shocked after learning that one of their colleagues tested positive for the dreaded killer coronavirus.

Haveri, Jan 16: Karnataka Chief Minister B S Yediyurappa on Wednesday hinted at inducting 16 MLAs into the Cabinet which was due for expansion despite the fact that it was a difficult task.

Participating in a function of Choudayya Community here, he further said one should understand the difficulty faced to undertake cabinet expansion in the prevailing situation and whoever gives suggestion should understand the circumstances otherwise the statements would lead to confusion among the community and people of the state.

He stated that 'as many as 17 MLAs resigned to make me Chief Minister and now their community people want their leader to become Minister, it is very difficult to satisfy all of them'.