Amit Shah has come to unseat Siddaramaiah; let DKS become CM: Poojary

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.

Mangaluru, July 8: Dakshina Kannada on Wednesday recorded its highest single-day spike in Covid-19 cases with 183 cases reported in the district, while Udupi reported 31 new cases.

DK also recorded two more fatalities – both patients with co-morbid conditions — taking the total death toll in the district to 28. Udupi has recorded three Covid-19 deaths.

The fresh spike saw total positive cases in DK shoot up to 1,542 and active cases to 819. As many as 12 patients were discharged from hospital on Wednesday. The positivity rate in the district now stands at 0.07 %. Health authorities as on date have received 22,181 samples and 20,153 out of 21,695 samples tested have turned out negative.

MLA’s gunman tests positive

The gunman assigned to former minister U T Khader tested positive on Wednesday and three others who were with him in the escort vehicle have been quarantined, said city police commissioner Vikash Kumar Vikash. A section of police commissioner’s office was shut for sanitisation as per protocol after staff working there were treated as primary contacts. The office per se has not been sealed contrary to ‘reports’ doing rounds in social media, he said.

Deputy commissioner Sindhu B Rupesh said the district reported two deaths — one late on Tuesday and the other during the day. The victims are a 57-year-old man and 32-year-old youth. Two of the 183 cases were secondary contacts, 25 were cases of influenza like illness, four cases of SARI, one a case of inter district travel, two with interstate travel, five with international travel history, 22 random samples and five pre-surgery samples.

Udupi district recorded 31 new cases taking the total positive cases recorded as on date to 1,421. Discharge of 1,189 patients meant that Udupi has 229 active cases.

Meanwhile, Kota Shrinivas Poojari, minister for fisheries on Wednesday inaugurated the Covid-19 lab at district hospital in Udupi. Karkala MLA Sunil Kumar inaugurated ambulance monitoring system to ensure expeditious transfer of infected patients to designated treatment centres.

Bantwal, Jun 5: A very rare white python, which had entered a house at Kavalakatte in Bantwal taluk of Dakshina Kannada, was caught by snake catcher Snake Kiran on Friday handed over to the authorities of Pilikula Nisargadhama.

This extremely rare white coloured python known as Albino was seen in the house of one Naushad.

The occupants of the house as well as residents of the area were panicky over seeing it. 

Later a friend of Naushad informed Snake Kiran who caught it and handed over to the care of Pilikula as per the advice of forest officer Sridhar.