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Hyderabad, Mar 31: Six people from Telangana who attended a religious congregation in Delhi's Nizamuddin died due to the novel coronavirus, the state government said on Monday.

"Coronavirus has spread among some of those who attended a religious prayer meeting from March 13 to 15 at Markaz in Nizamuddin area in Delhi," according to an official release. "Among those who attended were some persons from Telangana."

Two of the six died at the Gandhi Hospital, one each in two private hospitals, and one each in Nizamabad and Gadwal towns, the statement said, without mentioning the time of their deaths.

The special teams under the collectors have identified the persons who came in contact with the deceased and they are shifted to the hospitals, it said.

Police and paramilitary personnel cordoned off a major area in Nizamuddin West in south Delhi on Monday and over 200 people have been kept in isolation in hospitals after several people who took part in a religious congregation there showed symptoms of coronavirus.

The Telagana government asked those who participated in the prayers to inform the authorities. It will conduct tests and offer treatment to them free of cost, according to the release.

The government also requested the people to alert if they come to know about those who participated in the prayers.

Earlier a separate government release said a person died of COVID-19 in Telangana, taking the toll to two and the total number touched 77 after six fresh cases were reported on Monday.

As many as 13 patients who underwent treatment for the virus were discharged on Monday, a media bulletin on COVID-19 issued by the state government said.

A techie, the first COVID-19 case in Telangana, has been discharged recently. The state now has 61 active cases, the bulletin said.

Chief Minister K Chandrashekar Rao had on Sunday said barring a 76-year-old person, who had other ailments, the other patients were doing well.

Rao had said 25,937 people were under surveillance and being watched by 5,746 teams and they would be out of watch after completing their mandated 14-day quarantine period. He had said all those who are under observation would be out of vigil by April 7 if there are no fresh suspected cases.

"From March 30, their time is nearing completion. After that, they do not need to be under any surveillance. By April 7, we will have a situation of zero... We pray God that we should not get new cases,"

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.