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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.

Feb 29: The "Dadi of Shaheenbagh" on Friday said that Prime Minister Narendra Modi does not understand the pain of losing children, as speakers at an anti-CAA rally here called on protesters to maintain peace and not give in to any provocation.

Tushar Gandhi, the great-grandson of Mahatma Gandhi, said that the battle is not for a day or two, but the protesters will have to be prepared to continue it for years to come.

Asma Khatoon, who has earned fame as the "Dadi of Shaheenbagh" in Delhi, asked how can a person take care of the whole country when he cannot maintain his own family.

"He would have realised how it feels to lose a child if he had his own children," she told a gathering at the Park Circus Maidan, which is being termed as the Shaheenbagh of Kolkata with women holding a sit-in for the last 53 days to protest the Citizenship (Amendment) Act, proposed nationwide NRC, and the NPR.

The death toll Delhi's communal violence has gone up to 42.

She said it is not biryani that has attracted women to the protest at Shaheen bagh while holding that such vilification campaigns will have no effect on the agitation.

State BJP president Dilip Ghosh has claimed that "uneducated men and women" are protesting at Delhi's Shaheen Bagh and Kolkata's Park Circus as they get money and biryani purchased with foreign funds.

"Home Minister Amit Shah has called 20 protesters to meet him, but I want to tell him that we are one lakh and I want him to mention the place where he wants us to go for the meeting," she said.

Tushar Gandhi said, "People should stay united and not give in to any provocation," he said.

Gandhi said that the people of West Bengal are lucky to have Mamata Banerjee as their chief minister.

"They will try to break her also and it is necessary that you continue to give her support," he said.

Gandhi claimed that no one can harm a country where its mothers and sisters come out to save it.

He claimed that the CAA is not about Hindus or Muslims, but will really affect the poor people, who will be made to run around to get their papers instead of earning for their basic and daily needs.

"It's a dichotomous government that we have at the Centre. On the one hand, they want us to provide documents to prove our citizenship, while on the other they refuse to accept the papers that one produces before it for the purpose," he said.

He claimed that the government is forcing its people to resort to lies and declare that they are political refugees from countries like Bangladesh and Pakistan.

Gandhi claimed that time and again documents with the government like electoral rolls and land documents have been used to identify people of certain communities during riots.

"So it is dangerous to give too much information to the government," he said.

He called on the people to have faith in non-violence and asked them to maintain peace and harmony.

B R Ambedkar's great-grandson Rajratna Ambedkar claimed that it is the Adivasis who will also be affected by the CAA.

"I want to tell Modi and Shah that the country runs on the Constitution by Ambedkar and not M S Golwalkar (of RSS)," he said, adding that because of the rights conferred on people by the Constitution, those backward people who did not have the right to sit on a bullock cart are now flying jet planes.

He said that Modi and Shah committed an error by enacting the CAA as it has turned the people of the country into Indians only, instead of Hindus, Muslims, Christians or Sikhs.

"Every machinery of the country has been taken control of by the RSS. If one Modi or one Shah goes, they will bring in several more Modi or Shah," he said.

More than one in six youths were jobless since the onset of the COVID-19 pandemic while those who remain employed have seen their working hours cut by 23 per cent, according to a report by the International Labour Organisation (ILO).

According to the 'ILO Monitor: COVID-19 and the world of work: 4th edition' published on Wednesday, youths are being disproportionately affected by the pandemic, and the substantial and rapid increase in youth unemployment seen since February is affecting young women more than young men, reports Xinhua news agency.

The pandemic is inflicting a triple shock on young people.

Not only is it destroying their employment, but it is also disrupting education and training, and placing major obstacles in the way of those seeking to enter the labour market or to move between jobs, said the report.

At 13.6 per cent, the youth unemployment rate in 2019 was already higher than any other group.

There were around 267 million young people not in employment, education or training worldwide.

"If we do not take significant and immediate action to improve their situation, the legacy of the virus could be with us for decades," said ILO Director-General Guy Ryder.

"If their talent and energy is sidelined by a lack of opportunity or skills, it will damage all our futures and make it much more difficult to re-build a better, post-COVID economy."

The report called for urgent, large-scale and targeted policy responses to support youth, including broad-based employment/training guarantee programs in developed countries, and employment-intensive programs and guarantees in low- and middle-income economies.