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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.

Kasaragod, Apr 1: Kerala Chief Minister Pinarayi Vijayan on Tuesday announced a special action plan for Kasargod district where more people testing positive to the Coronovirous.

"The northern most district of the State has become the hot bed of Coronavirus infection with the maximum number of positive cases confirmed in Kerala," the Chief Minister told a press conference at the Government Secretariat.

“A special action plan will be implemented in Kasargod. Currently, Kasargod district has the maximum number of positive cases and also the highest number of people under hospital observation. Data from the panchayats in the district will be used to test people with symptoms and also to identify people in contact with them," he said.

Bengaluru, Mar 15: All 21 Madhya Pradesh MLAs from Jyotiraditya Scindia's camp, who were lodged here at Prestige Golfshire Club, have been shifted to Ramada hotel in Yelahanka ahead of Monday's floor test in the state assembly.

In view of their arrival, the concerned authorities have strengthened security outside the hotel.

Following the exit of Scindia from Congress, these MLAs claimed to have resigned from the state Legislative Assembly.

On March 11, Congress sent two of its leaders -- Sajjan Singh Verma and Govind Singh -- to Bengaluru in order to pacify some of these rebel MLAs.

Most of the rebel MLAs are perceived close to Scindia and were apparently unhappy at Scindia being "ignored" in the party.
Meanwhile, Madhya Pradesh Congress MLAs, who arrived in Bhopal from Jaipur today morning ahead of the floor test in the Assembly on Monday, have been shifted to Courtyard by Marriott Hotel.

These MLAs were accompanied by senior Congress leader Harish Rawat, who exuded confidence of Kamal-Nath led government winning floor test in the Assembly.

Both Congress and BJP have issued whips to all its MLAs for the legislative assembly session in Madhya Pradesh, which is scheduled to be held from March 16 to April 13.

On Saturday, Madhya Pradesh Governor Lalji Tandon had directed that a floor test will be held in the assembly on Monday.