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Mangaluru, May 15: In a shocking development, as many as 20 people from coastal Karnataka, who recently came from United Arab Emirates today tested positive for covid-19.

More than 175 repatriates were brought from Dubai to Mangaluru International Airport on May 12. Among them residents of Dakshina Kannada and Udupi districts were quarantined in their respective district. 

The throat swabs of all the passengers were sent for covid-19 testing on the following day. 21 of them obtained positive report today. Among those tested covid-19 positive, 15 are residents of Dakshina Kannada and five are from Udupi district. 

They were shifted to covid-19 hospitals in their respective districts today.

Mandya, Jul 23: Upset over contracting Covid 19, a 55-year-old man, ended his life by hanging himself, at the designated Covid hospital, in Mandya, on Wednesday night.

The deceased patient is from Kandegala village, Malvalli taluk, Mandya district. He was ailing from renal problems and was under treatment. 

However, he contracted the virus and tested positive for Covid-19. Upset over this, he ended his life by hanging himself on the window grill, in the hospital bathroom, midnight. The incident came to light when other patients went to the toilet.

His last rites were conducted as per the designated Covid-19 protocol, on Thursday, said District Health Officer Dr H P Manchegowda.

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.