UP govt remembers farmers only in ads: Priyanka Gandhi

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.

New Delhi, Mar 25: The Indian Rail Catering and Tourism Corporation (IRCTC) on Wednesday appealed to the people not to cancel their e-tickets on their own in case of trains being cancelled by the national transporter due to nation-wide lockdown to help curb the spread of novel coronavirus pandemic.

Clearing the doubts of the railway passengers, IRCTC spokesperson Siddharth Singh said, "Doubts have been raised regarding cancellation of e-tickets subsequent to the halting of railway passenger trains.

"It may be submitted that for trains cancelled by the railways in its complete run, refund on e-tickets is full and automatic. In this case, no cancellation exercise is required to be done on the part of the user," he said.

The IRCTC official said that if user cancels his e-ticket in situations of train cancellations, there are chances he may get "less refund". "Hence passengers are advised not to cancel e-tickets on their own for those trains which have been cancelled by the railways," he said.

He also said that the refund amount will be credited to the user account used for booking e-tickets automatically and no charges will be deducted by the railways in case of train cancellation.

His remarks came as the national transporter announced the suspension of the passenger, mail and express services from March 23 till March 31. However, the railways extended the suspension of services till April 14 in the wake of the three week lockdown announced by Prime Minister Narendra Modi from March 25 during his second special address to the nation on Tuesday night.

The railways has cancelled over 13,600 passengers trains across the country in a bid to combat the spread of novel coronavirus. Only freight trains are running to ensure the supply of essential services. About 9,000 freight trains are transporting essential items every day across the country.

On Wednesday, India recorded 562 cases of COVID-19 with 10 deaths.

Indore, Feb 3: Senior Congress leader Digvijaya Singh on Sunday attacked the Centre for conferring the Padma Shri on Pakistan-origin singer Adnan Sami, who became an Indian citizen in 2016.

Addressing "Save the Constitution, Save the Country" rally here in Madhya Pradesh, Singh said Sami's father had "pounded India with bombs" when he was serving with the Pakistani Air Force (PAF).

"Since Sami is an artist who has come from Pakistan, I had recommended his case to the Indian government for citizenship. He has got Indian citizenship under the Modi government," the Congress leader said, adding that he never made any recommendation to the government for conferring Padma Shri on Sami.

He said Sami's father had "dropped bombs against us" while flying a Pakistan Air Force combat plane.

"In contrast, Indian Army officer Sanaullah of Assam, who had fought against the enemy, was sent to a detention camp for failing to show documents (during the Assam NRC exercise). This is the citizenship law of the Modi government," he said.

Sami, born in London to a Pakistani Air force veteran, applied for Indian citizenship in 2015 and became a citizen of the country in January 2016.

He was one of the 118 people chosen for the Padma Shri awards by the Centre last month.