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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.

New Delhi, May 24: Overwhelmed by the donations that poured in from the society for his help, Phool Mia, the fruit seller in north Delhi's Jagatpuri area whose mangoes were looted by the ordinary people, said that those who helped him have made his "Eid" and have shown that "humanity is still alive".

Video footage that went viral on social media, shows that scores of passers-by looted the unattended crates of mangoes of a fruit seller after a fight broke out in the neighbourhood. The incident took place on Wednesday.

"My stock of mangoes worth Rs 30,000 was kept there. Some persons were fighting with each other fearing which I left the place to avoid any sort of altercation. When I returned, I saw that they were looting the mangoes kept there. There were 50-100 people who were involved in this act," Phool Mia, narrated the ordeal.

"A video got viral about the incident after which people donated to me on a portal. They empathised with me when I was ruined. I thank the media and all those people who have donated from the bottom of my heart as they made my Eid. Now, I would be able to celebrate Eid with my children. This shows humanity is still alive," he added.

However, four people have been arrested on the basis of video footage, Delhi Police said.

Mumbai, May 17: Much on expected lines, Maharashtra, on Sunday, extended the coronavirus lockdown till May 31, in order to control the spread of the virus, under the Epidemic Diseases Act, 1897, the state government said in a statement.

On Sunday afternoon, Chief Secretary Ajoy Mehta, in a notification said: "It is further directed that all earlier orders shall be aligned with this order and remain in force up to and inclusive of May 31, 2020. The calibrated phase-wise relaxation or lifting of lockdown orders will be notified in due course."

"Lockdown 3.0 ends today. Lockdown 4.0 will come into effect tomorrow and will be valid till May 31. There will be some relaxations in the fourth phase," he said.

"The green and orange zones will get more relaxations, in terms of starting more services. As of now only essential services are operational, he said.

Maharashtra has recorded 30,706 COVID-19 cases of which 22,479 are active. The death toll is 1135, while 7,088 patients have been discharged after recovery.

In exercise of the powers conferred under Section 2 of the Epidemic Diseases Act, 1898 and the powers, conferred under the Disaster Management Act, 2005, the Chairperson, State Executive Committee, issued direction to extend the lockdown till 31 May 2020 for containment of COVID-19 epidemic in the State and all Departments of Government of Maharashtra shall strictly implement the guidelines issued earlier form time to time, according to the statement.

Over the last two days,  Maharashtra Chief Minister Uddhav Thackeray held a series of meetings with his ministerial colleagues, senior leaders including NCP supremo Sharad Pawar and top officials.