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Kasaragod, Mar 23: The district administration on Monday decided to abandon efforts to map out the movement details of the NRI who came from Dubai recently and came into contact with many in North Kerala.

The district has been completely locked down since Monday morning, on the directive of the Central Government. Prohibitory orders have been slapped in the district since Sunday night to restrict socialisation of the people.

As the person now in isolation have allegedly been non-cooperative, the authorities were finding it difficult to sketch out a rote map as his movement and socialisation has been so vast and wide since his arrival here on March 12.

The middle aged and popular NRI who landed at Karipur airpprt on March 11 had been in Calicut till midnight prior to boarding the Maveli Express to make it to his hometown Kasaragod, which is 160 kms away from Calicut. He had come into contact with very many, including two MLAs of the district, prior to getting tested positive and getting isolated in the hospital.

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.

Udupi, May 19: Within minutes after health and family welfare department announced four fresh covid-19 cases in Udupi district, a girl who had come from central part of Karnataka tested positive for the coronavirus thereby taking the count of cases detected after last evening to five. 

With this the total number of confirmed covid-19 cases in the district rose to 16. Three among them have recovered. One patient died last week. There are 12 active cases. 

According to sources, the 17-year-old girl from Chitradurga had visited KMC hospital in Manipal for cancer treatment on May 16. 

Her throat swabs were sent for corona testing on the following day. Today she obtained a positive report. Hence, she was shifted to Dr TMA Pai Covid hospital.