All you need to know about Godhra train burning case

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.

Chennai, Jun 10: DMK MLA J Anbazhagan who had tested positive for coronavirus and was on ventilator support from June 3 passed away at a hospital in Chennai on Wednesday.

Coincidently, today is the 62nd birthday of the MLA.

"Anbazhagan J, who has been fighting for his life with severe COVID 19 pneumonia rapidly deteriorated early this morning. In spite of full medical support including mechanical ventilation at our COVID facility, he succumbed to his illness. He was declared dead at 08:05 hours on the 10th of June 2020," the hospital said in a statement.

In 2001, Anbazhagan was elected from T Nagar Assembly constituency. He served for five years.

Later in 2011, he was elected to Tamil Nadu Assembly from Chepauk-Thiruvallikeni seat. The DMK leader was re-elected from the same constituency in 2016.

Mumbai, Jun 14: A 42-year old man suddenly collapsed and died due to natural causes onboard Air India's Lagos-Mumbai flight on Sunday, the national carrier said.

The flight was part of Vande Bharat Mission, under which the Central government is operating special repatriation flights to bring back stranded Indians from abroad amid the coronavirus pandemic.

Air India's flight AI 1906 departed from Lagos in Nigeria at 7 pm Indian Standard Time on Saturday and landed in Mumbai at 3.45 am on Sunday.

"A passenger aboard AI 1906 of June 13 from Lagos to Mumbai passed away due to natural causes today.

"A doctor onboard along with our crew, trained to handle such medical emergencies, made a valiant attempt to revive the passenger, aged 42, who had suddenly collapsed, through resuscitation etc but all their efforts went in vain," the airline's spokesperson said.

He was declared dead onboard by the attending doctor. Mumbai International Airport Limited doctors attended to the passenger after the flight landed at 3.45 am and after all the procedures were complete, the body was sent to a hospital as per protocol, the spokesperson noted.

Relatives of the deceased were informed and aircraft was taken for full fumigation as per the norms, the spokesperson said.