Uncultured remark against Karkare: EC to issue notice to terror accused Pragya

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, Mar 20: The coronavirus pandemic will leave behind a global recession with small businesses, self-employed and daily wagers taking the worst hit, Mahindra Group Chairman Anand Mahindra said on thursday.

"The virus will eventually be conquered, but it will have left behind a global recession. The costs of that are incalculably high at this time. The most fearsome toll will be on small businesses, the self-employed & those whose lives depend on meagre daily wages," Mahindra said in a tweet.

Apart from the toll on lives, the legacy of Covid-19 may well be deaths due to stress, loss of livelihoods, a rise in homelessness and in extreme situations, civil unrest, he added.

"The only global experience that has lessons for us in the current situation is the last world war. In the aftermath of WW2, the US came up with the Marshall plan to revive Europe, effectively a giant fiscal pump-priming," Mahindra said.

In the US, the government dramatically dismantled regulations and opened up the economy to trade and these actions led to a boom-cycle that stretched to 1975, he added.

"This time, there will be no victors, only the vanquished. So every country will have to create its own post ‘virus war” marshall plan & take care of those in society who are hit the hardest. Perhaps we too can build the foundations of a sustained global growth cycle," Mahindra said.

Kochi, Mar 24: Long queues were witnessed in front of state beverages corporation outlets across Kerala on Tuesday despite the statewide lockdown to prevent the spread of the coronavirus.

As tipplers thronged the outlets unmindful of the curfew, officials asked them to ensure that they kept a one metre distance between them as part of preventive steps to check the COVID-19 transmission.

Official sources said precautionary measures have been taken at the beverages outlets to prevent the virus spread.

Only those wearing masks were allowed to stand in queues, the sources said.

Police were deployed to ensure that the people standing in queues keep a one metre distance between them, they added.

The opposition Congress slammed the CPI(M)-led LDF government for not taking steps to restrict crowds in front of the Kerala State Beverages Corporation (Bevco) outlets, apprehending that such a situation would pave way for spreading the virus.

Ernakulam district congress committee general secretary Sherin Varghese claimed if the government had implemented a 2017 Kerala high court order directing the beverages corporation to take remedial steps to end long queues in front of the outlets, such a situation would not have arisen.

"Had the beverages corporation complied with the court order, safety and security of persons standing in queues could have been ensured.

Now there is no protective measure to prevent the possible transmission of the coronavirus from a carrier to another person," he told PTI.

Meanwhile, the state government has directed that adequate distance be kept between people standing in queues.

Chief Minister Pinarayi Vijayan on Monday justified the decision to keep the liquor shops open citing the "peculiar" situation prevailing in the state.

Kerala is in a total lockdown since Monday midnight till March 31 to check the virus spread.