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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.

Thiruvananthapuram, May 20: As COVID-19 count surges to 666 with 24 new cases reported on Wednesday, Kerala Chief Minister Pinarayi Vijayan has said that if cases keep increasing in this manner, then the State will be in a 'serious situation.'

Out of 24 new patients, 12 have returned from abroad, 11 others from other States and one has been infected by a contact. Now, total positive cases in the State stand at 666 including 161 active cases, Chief Minister Vijayan said at press meet.

"If the number of COVID-19 cases increases like this, then the State will be in a serious situation. We have given more relaxations in lockdown guidelines. We need to have more strict measures in some areas," he said.

Speaking about the people who are coming to Kerala from other States, he stressed that all people coming from outside are "not carriers." However, the State has to tighten the security as some among those people are "carriers."

The Chief Minister while clearing that there is no restriction for the people to come back to Kerala, said: "Lakhs of people residing in other states cannot come together."

"There is no relaxation in containment areas. Those who came from outside have to be in quarantine. This is their moral responsibility. The State has implemented home quarantine successfully. Various level committees like ward committee, neighbours and residential associations are monitoring the people in quarantine," he said.

Chief Minister Vijayan has directed the police to visit people under home quarantine to take their report and district panchayat to make sure that all panchayats are working in a proper manner.

New Delhi, Apr 15: CPI-M leader Sitaram Yechury has sought a substantial increase in relief spending of the Central government in the fight against coronavirus, saying that there should be cash transfer of Rs 7,500 to families not paying income tax and distribution of free foodgrains to all needy.

In an article in the forthcoming issue of the party's mouthpiece -- People's Democracy -- Yechury said that India ranks among the countries that are testing the least for the coronavirus and testing should be increased rapidly.

Yechury said the financial stimulus package should be raised from the current 0.8 per cent to at least 5 per cent of GDP and States should be provided liberal funding.

"We must ensure that there are no starvation deaths that occur in our country. It is, therefore, imperative that the government must immediately implement a Rs 7,500 ex gratia cash transfer to all non-income tax-paying families and resort to universal distribution of free foodgrains to all needy people," Yechury said.

He said all MGNREGA workers should be paid wages irrespective of work and employers should be assisted financially to protect workers from job losses and wage cuts and arrangement should be made for the return of migrant workers to their homes.

"Testing is of crucial importance to identify the clusters where the pandemic is spreading in order to isolate and insulate them to contain the community spread. Inadequate testing does not provide us with such information. It is dangerous both for the inability to contain the spread and to identify the critical areas," the article said.

It said that till April 9, India's record of testing was 0.092 per thousand, while in Germany it was 15.96, Italy 14.43, Australia 12.99, Denmark 10.73 and Canada 9.99. "Unless our testing rate increases substantially, our strength to combat the pandemic will not grow," the article said.

Yechury said that the first case in India was reported on January 30 and "no substantive measures were taken despite this for seven long weeks" until the declaration of the lockdown on March 24.

"As far as the lockdown is concerned, many countries in the world moved with greater urgency - China locked down Wuhan on January 23, the whole of Italy was locked down on March 10, USA declared a national emergency on March 13, Spain on March 14, France on March 17 and UK on March 23," he said.

Yechury said the people were looking forward to the Prime Minister's address to the nation on the last day of the three-week countrywide lockdown.

"These three weeks have thrown up many experiences that need to be addressed urgently in order, both, to strengthen our fight against the COVID-19 pandemic and to protect the lives and survival of crores of our fellow citizens. On none of these issues of vital importance did the Prime Minister have anything substantial to say," he said.