‘Modi’s Kedarnath show after campaign is poll code violation’: TMC complains to EC

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, Apr 9: Kerala, which was among the first state in the country to report a Corona positive case, has turned its entire public healthcare system into a single interconnected grid to generate uninterrupted information and provide flawless services, thanks to the daily zoom or video conferences of top health authorities for chalking out a dynamic strategy to tackle the COVID-19 pandemic.

The daily zoom or remote conferences held by Health Minister K K Shailaja and top health sector officials with the medical and paramedical personnel on the ground have lent a cutting edge to the state government’s all out efforts in monitoring the situation on the ground and formulating effective responses to address the various needs and concerns of the people, an official release said on Thursday.

The Minister is joined in this meticulous exercise by top administrators and planners, including Dr Rajan N Khobragade, Principal Secretary, Health; Dr. Rathan U Kelker, State Mission Director, National Health Mission, Dr Saritha, Director of Health Services, Dr Ramla Beevi, Director of Medical Education and other senior officials.

New Delhi, Apr 11: Calling upon chief ministers to popularise Aarogya Setu app, Prime Minister Narendra Modi on Saturday said it will an essential tool in India's fight against coronavirus and referred to the possibility of the app being an "e-pass which could subsequently facilitate travel from one place to other".

Interacting with chief ministers through video conference, the Prime Minister mentioned how South Korea and Singapore had got success in contact tracing and said India has made its own effort through the app amid efforts to contain the spread of coronavirus.

A PMO release said that the Prime Minister spoke about popularizing the Aarogya Setu app to ensure downloads in greater numbers.

"He referred to how South Korea and Singapore got success in contact tracing. Based on those experiences, India has made its own effort through the app which will be an essential tool in India's fight against the pandemic, he said. He also referred to the possibility of the app being an e-pass which could subsequently facilitate travel from one place to another," the release said.

The Prime Minister had earlier this week urged people to download the app saying it is an important step in the fight against COVID-19 and its effectiveness will increase as more people use it.

"Aarogya Setu is an important step in our fight against COVID-19. By leveraging technology, it provides important information. As more and more people use it, it's effectiveness will increase. I urge you all to download it," he had said in a tweet.

The app launched earlier this month in public-private partnership enables people to themselves assess the risk for their catching the coronavirus infection.

The app makes its calculations based on a person's interaction with others, using Bluetooth technology, algorithms and artificial intelligence.