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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.

Kochi, Apr 28: The Central government on Tuesday told Kerala High Court that the Kerala government will have to take up with other states the matter pertaining to bringing back COVID-19 affected Malayali nurses.

A Division Bench of Justice PV Asha and Justice V Shircy asked the Kerala government to examine if there is any solution that may be considered and orally noted the suggestion that perhaps a video-conference may be conducted between the states on the matter.

The matter was posted for further hearing on April 30.

Counsel for the Central government said that the "Centre has issued guidelines for the protection of health workers. But in this specific case, state governments have assured that nurses are being given proper treatment."
"The plea is on apprehensions that they are not being treated well in the other states.

Centre could help if there is any necessary requirement thereafter," the Centre's counsel said.

Advocate Abraham Vakkanal, appearing for the state government, said that state chief secretary has written to Union cabinet secretary to relax travel restrictions amid COVID-19 lockdown to bring back the nurses.

Vakkanal said that the state has sought permission and is waiting for approval and will take further actions if permission is received on the matter.

Advocate Anupama Subramaniam, appearing for the petitioner, said that 68 Malayali nurses in other states have reached out to inform that they are not being given treatment and that facilities for food and shelter are also not readily available for them.

Kerala High Court had earlier asked the Centre and the state government to file their reply on the plea.

The court was hearing a petition seeking to bring COVID-19 affected Malayali nurses back to Kerala from other States considering their "poor health and working conditions".

New Delhi, Jun 1: India's COVID-19 tally on Monday witnessed its highest-ever spike of 8,392 cases, while 230 more deaths related to the infection were also reported in the last 24 hours, according to the Union Ministry of Health and Family Welfare (MoHFW).

The total number of coronavirus cases in the country now stands at 1,90,535 including 93,322 active cases, 91,819 cured/discharged/migrated and 5,394 deaths.

COVID-19 cases in Maharashtra continue to soar with the number reaching 67,655. Tamil Nadu's coronavirus count stands at 22,333 while cases in Delhi the number has reached 19,844