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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.

May 19: Congress general secretary Priyanka Gandhi Vadra's office on Tuesday said the Uttar Pradesh government has demanded that the 1,000 buses the party wants to ply for ferrying migrant labourers back to the state be handed over in Lucknow this morning and alleged that the move is politically motivated.

It also alleged that the demand shows that the UP government lacks the intention to help those stranded at the state's borders.

The Uttar Pradesh government on Monday had accepted the Congress' offer to run 1,000 buses to bring migrant labourers back to the state, a proposal which had triggered a war of words between the two sides.

In a letter to Additional Chief Secretary Avneesh Kumar Awasthi, Priyanka Gandhi's private secretary Sandeep Singh said a letter was received from the UP official at 11.40 am via email, in which it has been stated that 1,000 buses with all documents be handed over at Lucknow by 10 am on Tuesday.

"In a situation when thousands of workers are walking on the streets and thousands of people have gathered at the UP borders at various registration centres, sending 1,000 empty buses to Lucknow is not only a waste of time and resources but is also inhuman and the product of an anti-poor mindset," Singh said in the letter in Hindi.

"This demand of your government seems politically motivated. It does not seem that your government wants to help our labourer brothers and sisters who are facing a disaster," the letter said.

The state government had asked Priyanka Gandhi, who had made the offer, to provide it with a list of buses along with the names of their drivers and conductors.

Subsequently, her private secretary Singh had given details of the buses and its drivers to the UP government in an email.

"All details of the 1,000 buses are attached with this e-mail. Out of them, a few drivers will be reverified and those details will also be mailed to you in a few hours. I hope you will give permission for those buses to ply as soon as possible," Singh had said in the communication to the UP government on Monday.

The Congress leader had recently written to Uttar Pradesh Chief Minister Yogi Adityanath, seeking permission to run 1,000 buses at her party's expense.

The party had then accused the BJP-run UP government of ignoring the offer.

"The offer made to the chief minister through the letter on May 16 in connection with migrant labourers has been accepted," Additional Chief Secretary Awasthi (Home and Information) had said in a letter to Priyanka Gandhi's private secretary.

A little later on Twitter, Priyanka Gandhi, who is the Congress general secretary in charge of eastern Uttar Pradesh, had thanked Adityanath.

"Thank you for allowing us to run 1,000 buses at the expense of the Congress to help thousands of brothers and sisters walking on the roads in Uttar Pradesh," she had tweeted in Hindi.

She had said the Congress will stand with these people during the difficult time they face.

In a television interview earlier on Monday, Adityanath accused the Congress of playing politics over the plight of migrant workers.

Singh in his letter on Tuesday also expressed surprise at the chief minister, saying his government was demanding the details of buses since the last three days and asserted that the details were provided immediately after the letter from the UP government was received in this regard.

From March through May, around 1 crore migrant workers fled India’s megacities, afraid to be unemployed, hungry and far from family during the world’s biggest anti-Covid-19 lockdown.

Now, as Asia’s third-largest economy slowly reopens, the effects of that massive relocation are rippling across the country. Urban industries don’t have enough workers to get back to capacity, and rural states worry that without the flow of remittances from the city, already poor families will be even worse off -- and a bigger strain on state coffers.

Meanwhile, migrant workers aren’t expected to return to the cities as long as the virus is spreading and work is uncertain. States are rolling out stimulus programs, but India’s economy is hurtling for its first contraction in more than 40 years, and without enough jobs, a volatile political climate gets more so.

“This will be a huge economic shock, especially for households of short-term, cyclical migrants, who tend to come from vulnerable, poor and low-caste and tribal backgrounds,” said Varun Aggarwal, a founder of India Migration Now, a research and advocacy group based in Mumbai.

In the first 15 days of India’s lockdown, domestic remittances dropped by 90%, according to Rishi Gupta, chief executive officer of Mumbai-based Fino Paytech Ltd., which operates the country’s biggest payments bank.

By the end of May, remittances were back to around 1750 rupees ($23), about half the pre-Covid average. Gupta’s not sure how soon it’ll fully recover. “Migrants are in no hurry to come back,” Gupta said. “They’re saying that they’re not thinking of going back at all.”

If workers stay in their home states long term, policymakers will have more than remittances to worry about. If consumption falls and the new surplus of labor drives wages down, Agarwal said, “there will also be a second-order shock to the local economy. Overall, not looking good.”

India announced a $277 billion stimulus package in May and followed it up with a $7 billion program aimed at creating jobs for 125 days for migrants in villages across 116 districts. Separately, local authorities are also looking for solutions.

Officials in Bihar have identified 2,500 acres of land that could be made available to investors, said Sushil Modi, deputy chief minister of Bihar, a state in east India. “We can use this crisis as an opportunity to speed up reforms,” he said.

The investors haven’t materialised yet, and in the meanwhile, state governments are relying on the national cash-for-work program that guarantees 100 days worth of wages per household.

Skilled workers don’t want to do manual labor offered through the program, and even if they did, says Amitabh Kundu of RIS, many think of it as beneath their station. “There will be an increase in social tensions,” he predicts. “Caste may again start playing a role. It’s absolute chaos.”

For skilled workers, initiatives vary:

* Uttar Pradesh, which received 3.2 million people, is compiling lists of skilled workers who need employment and trying to place them with local manufacturing and real estate industry associations. So far, the government says, it’s placed 300,000 people with construction and real estate firms.

* Bihar has placed returners in state-run infrastructure projects and hired others to stitch uniforms and make furniture for government-run schools, even as they waited in quarantine centres, said Pratyay Amrit, head of the state’s disaster management department.

* The eastern state of Odisha announced an urban wage employment program aimed at putting as many as 450,000 day labourers to work through September. Some 25,000 people have been employed, so far, under the scheme, G. Mathivathanan, principal secretary for housing and urban development said.

Attracting Investments

It’s not clear any of this will be enough to make a dent, says Ravi Srivastava, professor at New Delhi-based Institute of Human Development, adding that the states don’t have much of a track record on economic development.

“It was the failure of these states to improve governance and put development plans in place that led to the out-migration in the first place,” he said.

But officials and workers’ rights advocates see opportunity. Uttar Pradesh has established liaisons to encourage companies from the US, Japan and South Korea to establish manufacturing in the state. There and in Madhya Pradesh and Rajasthan, the government has made labour laws more friendly to employers, making it easier to hire and fire workers.

Modi, the minister from Bihar, said the migration may also give workers--historically a disenfranchised group--new power, particularly as urban centres struggle. “The way industries treated workers during the lockdown -- didn’t pay them, the living conditions were poor -- now these industries will realize the value of this force,” Modi said.

“In the days to come, labour will emerge as a force that can’t be ignored anymore,” he added. “That’s the new normal. We will work out how to ensure dignity, rights to our people who are going to work in other states.”

Bihar is due for elections by November, a vote that could be an early test of the mass migration’s political consequences. The state is currently governed by a coalition that includes Prime Minister Narendra Modi’s Bharatiya Janata Party. Amitabh Kundu, a fellow at the Research and Information System for Developing Countries, a New Delhi-based government think-tank, said migrant workers are likely to be angry voters.

“Chief ministers are telling these migrants that they will not have to go back for work,” he said. “But their capacity to do something miraculous in the next four to five months is doubtful. If they can retain even one-fourth of the migrants, I would call it a success.”