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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 13: Prime Minister Narendra on Tuesday announced Rs 20 lakh crore special economic package for the country to be 'self-reliant' and deal with COVID-19.

"I announce a special economic package today. This will play an important role in the 'Atmanirbhar Bharat Abhiyan.' The announcements made by the government over COVID, decisions of RBI and today's package totals to Rs 20 lakh crore. This is 10 per cent of India's GDP," said Prime Minister Modi in his address to the nation. The Prime Minister said that humanity would not accept defeat from the coronavirus but the people have to stay safe and move forward.

"We had never seen or heard about such a crisis ever before. This is definitely unimaginable for mankind. It is unprecedented. But humanity will not accept defeat from this virus. We have to not only protect ourselves but also move forward," he said.

Talking about the gravity of the virus, Modi said: "It has been four months the world is fighting COVID-19. More than 42 lakh people from different countries have been infected by COVID-19. More than 2.75 lakh people have lost their lives due to the virus. In India too many families have lost their dear ones, I express my condolences to them."

"Today when the entire world is in crisis, we will have to further firm our resolve," he added.

The Prime Minister on Monday held a video conference meeting with Chief Ministers of all states to discuss the road ahead in India's fight against COVID-19 and noted that he was of the firm view that measures needed during the third phase of lockdown will not be needed in the fourth phase.

Prime Minister Modi had said the need was to reduce the transmission rate of the disease and to increase public activity gradually while adhering to all the guidelines and efforts to be made towards achieving both these objectives.

The phase three of the lockdown is coming to an end on May 17.

Sitamarhi, Jun 15: Eyewitness accounts from locals in Bihar's Sitamarhi district recount the brutality and intimidation by Nepal's security personnel who on June 12 had resorted to unprovoked firing on a group of people at the international border, which left one Indian dead and two others injured.

"18-20 shots were fired for over one hour and everyone is in shock even now," said Nitish Kumar, a resident of Jankinagar recalling the incident that took place early on Friday morning.

Nepal's Armed Police Force (APF) opened fire at the Lalbandi-Jankinagar border in which three men - Vikesh Yadav, Umesh Ram and Uday Thakur - suffered gunshot injuries. Vikash Yadav succumbed to his injuries on Friday itself.

Another person Lagan Kishore, who was at the border with his family to meet his daughter-in-law, a Nepali national and her family, said he was detained by the APF personnel who dragged him to the other side of the border.

Lagan Kishore said that the Nepali personnel abused and hit him with rifle butts and even abused his son and later resorted to firing.

Several residents of Jankinagar, who spoke to media, termed the incident as "unfortunate and shocking".

Nitish Kumar recalled: "A family was here to meet their in-laws (Nepali nationals). The daughter-in-law was talking to her family while her husband and her father-in-law sat a little distance away. Suddenly I saw Nepali personnel abusing her husband who complained about it to his father. All of a sudden the Nepali forces started thrashing them and then opened fire. They also took the father into custody."

"We were all shocked. I could hear about 18-20 gunshots fired over a period of one hour," Kumar said.

Another local, Ajit Kumar, said he was perplexed with the behaviour of the Nepali Police.

"There used to be no problems earlier. We don't understand what happened to the Nepal Police that day. The firing is unfortunate. If this continues, how will people in the border area live?" he questioned.

Ajit Kumar stated that such an incident has taken place for the first time. "People from here go to work in fields in Nepal and their people come to work in our fields. Such a thing has happened for the first time. About 80 per cent of our people are married to Nepalis," he said.

Many people who live in the adjoining districts of Bihar, which shares over 600 kilometres of border with Nepal, have relatives on either side of the border.

Meanwhile, Nepali police have claimed that Lagan Kishore, who was taken into custody following the firing by APF and handed over to Indian Security Forces at no man's land on June 13, was detained for trying to snatch a weapon from one of their personnel during an altercation.

However, both Kishore and his family have denied the claims and said he was "dragged" across the border and was beaten.

Kishore said that during the firing he had rushed towards the Indian side but Nepalese personnel hit him with rifle butt and took him to Nepal's Sangrampur. He was also asked to confess that he was taken into custody from the Nepali side.

"We ran to return to India when they started firing, but they dragged me from the Indian side, hit me with a rifle butt and took me to Nepal's Sangrampur. They told me to confess that I was brought there from Nepal. I told them you can kill me but I was brought there from India," said Kishore.

Kishore's son also said that Nepali personnel started abusing them and hit him and his father.

Speaking to ANI, Kishore's son said, "We went to meet my brother-in-law. Security personnel started abusing me but I could not understand their language. However, my brother's wife asked them to not abuse. After that, they came to the Indian side and hit me. I told my father about the incident and he confronted them."

"They started beating him and called fellow personnel who started firing and dragged my father from the Indian side, hit him with a rifle butt and took him to Nepal''s Sangrampur," he said.

Relations have become strained between India and Nepal after the latter released a map showing parts of Indian Territory-Lipulekh, Kalapani and Limpiyadhura as its own.