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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.

As the Indian workforce navigates a shrinking job market in lockdown times, two in five professionals believe that the number of jobs and scheduled interviews will decrease in the next two weeks, a new LinkedIn survey said on Tuesday.

The news comes as bittersweet for Indian professionals as more than one in three stated they will now spend more time working on their resumes and preparing for interviews.

Professionals from healthcare, manufacturing and corporate service industries anticipate a decrease in personal spending and personal investments in the next six months, according to the findings of the fortnightly LinkedIn Workforce Confidence Index based on responses from 2,903 professionals in the country.

This findings showed that while India's overall confidence remains steady, the country's confidence in jobs is beginning to trend downward.

However, employees at large enterprises (firms with over 10,000 workers) are more confident about the future of their employers when compared to their peers from mid-market and SMB companies.

The findings showed that 41 % of enterprise professionals think their companies will do better in the next six months, while 63 % think their companies will be better off one year from now.

However, "the enterprise professionals are least confident about the future of their jobs, finances and careers, when compared to their SMB and mid-market peers".

The findings showed that 52 % of healthcare, 48% of corporate services, and 41 % of manufacturing professionals anticipate a decrease in investments in the next 6 months.

Over the past three months, many organizations have shifted to a remote working model to circumvent the pandemic and ensure business continuity.

Three in five marketing professionals feel confident about being effective when working remotely, joined by more than half of project management and engineering professionals, who are also confident about the effectiveness of remote working.

In contrast to this optimism, only 39 % of HR, 36% of finance, and 31 % of education professionals think they would be effective when working remotely, said the survey.

New Delhi, Jul 16: With the highest single-day spike of 32,695 cases and 606 deaths reported in the last 24 hours, India's COVID-19 tally on Thursday reached 9,68,876, informed the Union Ministry of Health and Family Welfare on Thursday.

The total number of COVID-19 cases includes 3,31,146 active cases, 6,12,815 cured/discharged/migrated and 24,915 deaths.

As per the Ministry, Maharashtra -- the worst-affected state from the infection -- has a total of 2,75,640 COVID-19 cases and 10,928 fatalities. While Tamil Nadu has a tally of 1,51,820 cases and 2,167 deaths due to COVID-19.

Delhi has reported a total of 1,16,993 cases and 3,487 deaths due to COVID-19.

Meanwhile, as per the information provided by the Indian Council of Medical Research (ICMR), 1,27,39,490 samples have been tested for COVID-19 till 15th July, of these 3,26,826 samples were tested yesterday.