Previous govts hated development, says PM Modi

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 20: The government on Thursday said one Indian who tested positive for coronavirus has died in Iran while the other citizens infected with the disease are being provided treatment and taken care of by the Iranian government.

Noting that the virus tends to be more fatal for those whose immunity levels are low, a senior MEA official said the deceased, an elderly person, belonged to the vulnerable age group and had health-related complications.

The death was not because of lack of medical attention or care, he said.

"We have evacuated 590 people from Iran where the situation is very severe. The Indians infected with coronavirus in Iran have been segregated and taken care of very well by the government there. We believe they will recover and we will bring them back," the MEA official said, adding that 201 Indians were evacuated from Iran on Wednesday.

The official said closely knit families required some persuasion and counselling during the process of segregation to prevent the spread of the contagion.

The Indian ambassador and other officials explained the consequences of infected people not being separated from their families and were successful to a large extent in segregating the positive cases from the negative ones, he said.

"Some pilgrims and students are still there and our embassy and mission are in control (of the situation)," the official said.

New Delhi, Jan 3: The National Payments Corporation of India (NPCI) on Thursday said the homegrown payments technology RuPay will offer 40 per cent cashback for its international card users for transactions in select countries.

Indians travelling to the UAE, Singapore, Sri Lanka, the UK, the US, Spain, Switzerland and Thailand will be able to earn up to Rs 16,000 cashback per month by getting their RuPay International Card activated, the NPCI said in a release.

With RuPay International cards --JCB, Discover and Diners Club--customers using multiple cards can earn more cashbacks under the 'RuPay Travel Tales' campaign.

To avail the cashback benefit, customers will have to do a minimum transaction of Rs 1000 and the maximum cashback is capped at Rs 4,000 for a single transaction.

The offer can be availed by customers using RuPay International Card four times a month that can give them a chance of earning up to Rs 16,000 as cashback.

Praveena Rai, COO, NPCI said, "We always aim to create an end-to-end value proposition for RuPay International cardholders to make their overseas travel experience seamless and memorable. The campaign is not only providing an exciting platform for travelers to earn cashbacks but also motivating them to migrate towards digital transactions nationally and globally".

Apart from earning cashbacks, RuPay International cardholders can access to RuPay affiliated domestic/international airport lounges.

They also can avail attractive offers on booking international fights and hotels in association with Thomas Cook and Make My Trip, the release said.

RuPay has a partnership with Discover Financial Services (DFS) and Japan based JCB International, allowing RuPay users the access to across 190 countries.

As on date, there are over 1,100 banks live on RuPay platform including SBI, HDFC Bank, Axis bank, among others.

RuPay card base has crossed 600 million, half of which are in the mid and premium segments, NCPI said.

NPCI was incorporated in 2008 as an umbrella organization for operating retail payments and settlement systems in India. An initiative of RBI and IBA under the provisions of the Payment and Settlement Systems Act, 2007, NPCI was initiated for creating a robust payment and settlement infrastructure in the country.