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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.

Washington DC, Feb 7: United States on Thursday asked all countries to speak out against mistreatment of Muslims living in China especially in Xinjiang region by Chinese authorities.

Alice G. Wells, Principal Deputy Assistant Secretary for the Bureau of South and Central Asian Affairs, while talking to reporters appreciated the steps taken by Central Asian states to ensure that no ethnic Kazakh, Uighur, Kyrgyz is refouled to China and that the human rights of individuals who reach Central Asia are observed.

"As a matter of principle we urge all countries, not just Central Asian countries, to speak out against human rights abuses that are evident against Muslims in all of China but certainly in Xinjiang. And the countries of Central Asia, several of the countries of Central Asia have deep first-hand knowledge of those abuses given the direct impact it has on their own populations who have loved ones, family members, that are swept up in these detention centers," Wells said.

"We appreciate steps by Central Asian states to ensure that no ethnic Kazakh, Uighur, Kyrgyz is refouled to China, that the human rights of individuals who reach Central Asia are observed. And we also appreciate I think what countries like Kazakhstan can do to promote the free and safe travel of compatriots, ethnic compatriots across the border," she added.

China has been accused of oppressing the Uighurs by sending them to mass detention camps, interfering in their religious activities and sending the community to undergo some form of forceful re-education or indoctrination. However, Pakistan has stayed mum over this issue.

As many as 1 million people, or about 7 per cent of Xinjiang's Muslim population, have been incarcerated in a sprawling network of "political re-education" camps, according to US and UN studies.

In 2018, the New York-based Human Rights Watch released a report accusing Beijing of a "systematic campaign of human rights violations" against Uighur Muslims in Xinjiang.

Beijing says its camps in Xinjiang are "vocational training centres."

Last year, several documents leaked revealed details about Beijing's fears about religious extremism and its wholesale crackdown on Uighurs.

The US had called on the Chinese government to "immediately release all of those who are arbitrarily detained and to end its draconian policies that have terrorised its own citizens in Xinjiang."

May 12: Several Indians in the US, either on the H-1B work visa or Green Card having children who are American citizens by birth, are being prevented from travelling to India aboard the special repatriation flights being run by Air India amidst the coronavirus-linked global travel restrictions.

According to the regulations issued by the Indian government last month and updated last week, visas of foreign nationals and OCI cards, that provide visa-free travel privileges to the people of Indian-origin, have been suspended as part of the new international travel restrictions.

For some of the Indian citizens like the Pandey couple in New Jersey (name and place changed at request), it's a double whammy. Having lost their H-1B job, they have to go back to India within the stipulated 60 days as required by law. The couple has two kids aged one and six years who are American citizens.

In the wee hours of Monday, they had to return from Newark airport as Air India refused to give their kids a ticket to fly to India along with them, despite them having a valid Indian visa. The young mother and father are Indian citizens.

They said that the officials from Air India and (Indian) Consulate (in New York) were very cooperative.

Also Read: COVID-19: Top senators urge Trump to temporarily suspend all new guest worker visas, including H-1B

But they could not do anything as their hands were tied by the latest regulation issued by the Indian government, a shocked Ratna Pandey told PTI.

"I would like to urge the Indian government to reconsider their decision on the humanitarian basis," said the Indian national who has lost her job but could not leave the US within the stipulated 60 days to avoid any future visa complications.

She now plans to make an appeal to the US Citizenship and Immigration Services (USCIS) to extend their stay.

Last month, H-1B visa holders, mostly Indians, launched a White House petition urging US President Donald Trump to extend their permissible stay from 60 to 180 days after job loss. However, there has been no decision from the White House so far.

While there is no official statistics of how many Indian H-1B visa holders have lost their jobs, it is believed to be substantial.

The US, due to the coronavirus pandemic, is experiencing an unprecedented unemployment rate and more than 33 million Americans have lost their jobs in the last two months. Given this massive job loss, Indians, who have lost their jobs, are unlikely to get one and thus many would have no other option but to travel back home.

In the case of single mother Mamta (name changed), the situation is graver as her son is just three-month old. Only she was given the ticket and the infant was not allowed to fly along with her because he carried an American passport.

"I would like to request the Indian government to let us fly back home. I don't want to stay in the US any longer," she told PTI hours after being prevented from boarding her hometown Ahmedabad-bound flight from Newark on Sunday.

"I am alone here. I don't have a relative here. It's a difficult situation," she said.

"Vande Bharat Mission is a humanitarian mission. But this is certainly inhuman," said Rakesh Gupta (name changed) from Washington DC.

An H-1B professional, Gupta has lost his job and needs to return to India within the stipulated 60 days. He and his wife, Geeta (name changed) being Indian citizens, received the confirmation of their seats in the flight but have been told that their two-and-a-half-year-old daughter cannot travel with them as she carried an OCI card.

"I don't believe this," he said.

Unlike the Pandey couple and Mamta, who had made the payment of USD 1,361 per ticket for their flight back home, Rakesh has not made the payment. Air India has said that the money would be refunded.

All the three Indian citizens requested the Indian government to help them travel back home by making necessary changes in the current regulations.

As per a recent government notification, all existing Indian visa holders, and visa-free travel facility, granted to OCI card holders who are not in India, have been suspended till restrictions on international air travel remains.

New York-based community leader Prem Bhandari said that the May 5 travel advisory has created multiple painful issues for the OCI card holders in the US and also to Indian citizens who are either on Green Card or H-1B visas and want to travel back home, but cannot leave their kids who are Americans by birth.

"We would like to express our disappointment with the discrimination between OCIs and citizens in respect of entering India at this critical stage when many OCIs have lawfully built their homes, families and businesses in India," Bhandari said in a letter to Union Home Secretary Ajay Kumar Bhalla on Monday.