Gujarat HC rejects Zakia Jafri's plea against SIT's clean chit to Modi

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.

Kochi, Feb 14: A special National Investigation Agency (NIA) court on Friday extended the remand of Thalassery-based students Allan Shuhaib and Thaha Fasal till March 13.

They were arrested under the Unlawful Activities (Prevention) Act in Kozhikode in November 2019.

Meanwhile, Alan Shuhaib has approached the High Court seeking permission to appear for the LLB 2nd semester exam scheduled on February 18.

Kerala Chief Minister Pinarayi Vijayan on February 6 wrote to Home Minister Amit Shah, urging him to transfer the case of the two students, who were arrested for alleged links with Maoists, from the NIA to state police.

Allan and Thaha, students of law and journalism respectively of Kannur University, were taken into custody by the police from Pantheerankavu in Kozhikode on November 1 last year for alleged links with the Naxals.

The duo was charged under Sections 20 (punishment for being a member of terrorist gang or organisation), 38 (offence relating to membership of a terrorist organisation) and 39 (offence relating to support given to a terrorist organisation) of the UAPA.

New Delhi, Apr 24: Congress leader Rahul Gandhi has termed the government decision to freeze Dearness Allowance of Central government employees for a year as "insensitive and inhuman."

The former Congress President in a tweet said: "Lakhs and crores are being spent on the Bullet Train and New Delhi's Central Vista which should have been suspended, but the government has deducted DA of Central government employees and pensioners... It is insensitive and inhuman."

"The tragic part is that by deducting this amount from January 1, 2020 up to 30th June, 2021 for a period of 1.5 years, the government of India proceeds to deduct almost Rs 38 thousand crore from the income of these middle class government employees and pensioners, who rely completely on the pay and pensions that they receive," said Randeep Surjewala, chief spokesperson of Congress.

There are about 50 lakh such serving government employees and about 62 lakh pensioners.

"Even more tragic and objectionable is the fact that the government of India has not even spared our armed forces. The government has deducted Rs 11 thousand crore of the 15 lakh serving armed forces personnel and nearly 26 lakh military pensioners. What is their fault? They are serving the nation in times of all types of crises," said Surjewala.

The Congress alleged that the government did not spare the savings scheme.

Instead of curbing the wasteful expenditure, the government has been constantly hitting at the income of government employees and the middle class, it added.