Amity University confers honorary doctorate on Thumbay Moideen

Bengaluru, May 13: 26 new covid-19 cases have been reported in Karnataka taking the total cases to 951. This includes 32 COVID deaths, one non-COVID death and 442 discharges.

The new cases include eleven cases from Bidar - all of whom are from the containment zone - , four from Hassan, two each from Davangere, Kalaburgi, Vijayapura and Uttara Kannada and one each from Bengaluru Urban, Ballari and Dakshina Kannada.

All the cases reported in Hassan and Vijayapura are with a travel history to Mumbai. In Bengaluru Urban, a nurse from a designated COVID hospital who was under quarantine has tested positive.

32nd death

The latest death reported was that of a 60-year-old man in Kalaburgi district. The deceased man from a containment zone was brought dead on May 11 to a designated hospital in Kalaburagi, and he has tested positive for COVID-19, it said.

Mangaluru, Apr 4: With the district administration formally confirming three new cases of covid-19, the total number of coronavirus positive cases in Dakshina Kannada today mounted to 12. 

A 43-year-old man from Thumbey in Bantwal taluk of Dakshina Kannada had been to Delhi on March 11 due to personal work and returned on March 22. His throat swabs were sent for testing on April 2 though he was healthy. Today the report of the test claimed that he was infected with covid-19. However, he is still said to be healthy.

In another case, a man from Udupi, who had returned from Dubai on March 21, was under medical observation after he landed at Mangaluru International Airport. The district administration today claimed that he too is suffering from the covid-19. 

A resident of Thokkottu, on February 6, had travelled to Mumbai and then visited Delhi. On March 6 he had returned to Mangaluru. On April 2, his throat swabs were sent for testing and the report today showed positive.

All three have been admitted to Wenlock Hospital for treatment.

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.