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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 15: With an increase of 3,967 COVID-19 cases in the last 24 hours, India's tally of coronavirus cases reached 81,970 cases, according to the Union Ministry of Health and Family Welfare on Friday.

According to the latest figures, 51,401 patients are active coronavirus cases while 27,919 patients have been cured/discharged and one patient has been migrated.

With a rise in 100 deaths due to COVID-19 in the last 24 hours, the number of deaths now stands at 2,649.

According to the Health Ministry, Maharashtra is the worst-hit state with regard to the number of COVID-19 cases with 27,524 cases of which, 6,059 patients have been cured/discharged and 1,019 succumbing to the virus.

Tamil Nadu has a tally of 9,674 cases inclusive of 2,240 patients cured/discharged and 66 fatalities.

Gujarat has a total of 9,591 cases which include 3,753 patients cured/discharged while 586 have lost their lives due to coronavirus.

Delhi has a tally of 8,470 cases of which 3,045 patients cured/discharged and 115 fatalities.

Thiruvananthapuram, Apr 1: A day after the Kerala Government issued orders to provide special alcohol passes on doctor's prescription to tipplers, who exhibit withdrawal symptoms, the Excise Department received 40 applications from across the state.

Speaking to ANI, a Senior Excise Official said, "Around 40 people approached us with doctor's prescriptions to get liquor passes across the State. We will forward it to Beverages Corporation and they will conduct home delivery of liquor."

Ernakulam topped the list with eight applications, while Kottayam Excise Office received four and Thiruvananthapuram office received three applications.

"As per the notification we received, a maximum of three litre of alcohol can be provided in a week for a person. For availing liquor again they will have to submit fresh application for the liquor pass," the official added.

An order in this regard was issued by the government on Monday night which outlines the necessary steps to be taken by a person with withdrawal symptoms to purchase alcohol.

As per the order, any individual with a prescription from a government doctor or a doctor from a Taluk hospital or government hospital, where the doctor mentions the patient's "Alcohol Withdrawal Symptoms" can submit the prescription for alcohol to the nearest Excise Range office.

A form also has been provided which should be duly filled to get the liquor pass. The Excise Department after the scrutiny may allow the person to buy Indian Made Foreign Liquor (IMFL) from the beverages corporation.

However, the Kerala Government Medical Officers Association (KGMOA) came out against the order, saying that doctors affiliated with the organisation will not give a prescription for liquor. Further, in a statement issued they said they are observing a 'black day' on Wednesday in protest against the government move.

The Indian Medical Association (IMA) also had termed the direction by the Kerala government 'unscientific' and said doctors had no legal obligation to prescribe alcohol.

After the liquor ban was enforced in view of the lockdown, Kerala has witnessed a number of suicide cases allegedly connected with withdrawal symptoms.

Announcing the decision Kerala Chief Minister Pinarayi Vijayan had also mentioned that the government was issuing such a direction following reports of people developing suicidal tendencies due to the unavailability of alcohol.