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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, Ma 9: Three more persons from Bantwal taluk in Dakshina Kannada district tested positive for Covid-19 today. All three are members of a family.

The infection is reportedly linked to First Neuro Hospital of Mangaluru, which has emerged as a coronavirus hub in coastal Karnataka.

With this, the total number of coronavirus cases in the district mounted to 31 including six outsiders. Three of them have lost their lives. Currently there are 15 active cases in the district.

The newly identified coronavirus patients are a 30-year-old man and two elderly women aged 60 and 70 years.

They have contracted the infection from a 69-year-old man from Bantwal who was confirmed with COVID-19 infection on May 1. All the three members now infected belong to his family.

The man had got the infection from a woman identified as P-390. He happens to be a relative and neighbour of the deceased woman who belonged to Bantwal Kasaba village. Eight  members of his family were quarantined, of whom three tested positive today.

Mangaluru: The Karnataka-Kerala border closure at Talapady amidst nationwide Covid-19 lockdown has not only prevented the movement of vehicles and people from Kasaragod to Mangaluru but also stopped the supply of life-saving drugs from Karnataka’s medical hub to its bordering district.

Hundreds of people from Kasaragod and Kannur districts who were treated in hospitals of Mangaluru for past several years are still dependent on some of the medicines that are available only in Mangaluru. Such medicines have become inaccessible for Keralites following the border closure. Every day, a number of people from Kerala call their acquaintances in Mangaluru to see if there is a way to get medicine.

In fact, Karnataka government has blocked all 23 roads that connect the state with Kerala. The reason given was, Kasaragod is the hotbed of coronavirus and allowing traffic even in emergency cases might lead to spread of Covid-19 in border districts of Dakshina Kannada, Kodagu and Mysuru. The attitude has resulted in the death of around a dozen people in Kasaragod district in last couple of weeks.

Even after the intervention of the Supreme Court a few days ago, the authorities in Karnataka are facing the allegation of being hostile either by blocking the way ahead or turning a deaf ear to the patients reaching their border. 

At this juncture, three Good Samaritans – P K G Anoop Kumar of Canara Engineering College, Mangaluru, Satheesh Shetty of Kasaragod Patla and P Jayaprakash of Ponnangala – have come to the aid of the Malayalee patients who are dependent on medicines from Mangaluru. 

The three activists who are currently staying (in fact stranded amidst lockdown) in Mangaluru, are delivering life-saving medicines to patients in Kerala through Kerala fire servicemen and policemen posted at the Talapady border. 

Anoop Kumar says that took the initiative after a woman, Maria Augustine from Chemberi (Taliparamba) Nellikkutty, contacted him for a medicine. He managed to buy it from a medical store in the port city and handed it over to a Kerala fire serviceman at Talapady border. 

All three are activists of Communist Party of India (Marxist). After moving to Mangaluru, they set up ‘We Donate Charitable Society’ to donate blood. The activists say that they are ready to dispatch medicines from Mangaluru to any person in Kerala. Those Keralites who are in need of medicines from may contact: 888471344 - Anoop, 9895135881 - Jayaprakash