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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, Jul 6: India's COVID-19 tally neared the 7 lakh mark with 6,97,413 cases after 24,248 new cases were reported in the last 24 hours, said the Union Ministry of Health and Family Welfare.

As per the Health Ministry, there are 2,53,287 active cases in the country while 4,24,432 patients have been cured or discharged. While one patient has migrated.

425 new deaths were reported in the last 24 hours in the country due to COVID-19, taking the number of patients succumbing to the deadly virus to 19,693.

As per the Health Ministry, Maharashtra continues to be the most impacted state from the infection with 2,06,619 cases and 8,822 fatalities due to the virus. Tamil Nadu in second place has a total of 1,11,151 cases and 1,510 fatalities.

The national capital's COVID-19 cases are also nearing the 1-lakh mark with 99,444 coronavirus cases and 3,067 deaths.

The total number of samples tested up to July 5 is 99,69,662 of which 1,80,596 samples were tested yesterday, informed the Indian Council of Medical Research on Monday. 

New Delhi, Feb 28: The Congress on Friday reacted sharply to the petition in the court seeking registration of a First Information Report against Sonia Gandhi, Rahul Gandhi and Priyanka Gandhi Vadra for alleged hate speeches. It said the petition was to save BJP leaders Pravesh Verma, Anurag Thakur and Kapil Mishra, referring to the trio as "PAK".

Congress leader Jaiveer Shergil told news agency, "It is political interest litigation to hide the failure of the government and to put a lid on the BJP's involvement in fuelling the fire in Delhi riots.

"This is to hide and save BJP's PAK -- Pravesh, Anurag and Kapil," said Shergil.

The BJP has two parameters, the laws for the common man and citizens of the country are different from those for the BJP leaders, added Mr Shergil.

The Delhi High Court on Friday issued notices on a petition for the registration of an FIR against Sonia Gandhi, Rahul Gandhi, Priyanka Gandhi Vadra and others on charges of delivering hate speeches.

Congress said that the PIL was politically motivated and the inaction on the hate speeches made by the BJP leaders, which led to the riots, was shocking.

"When there are 48 cases registered, why three cases against the BJP leaders are not registered," asked Mr Shergil.

A Bench of Chief Justice DN Patel sought responses from the Central and Delhi governments apart from Delhi Police on a petition filed by Lawyers Voice. The matter will again be heard on April 13.

The petition also sought a case against Aam Aadmi Party leaders Manish Sisodia and Amanatullah Khan, All India Majlis-e-Ittehadul Muslimeen leaders Akbaruddin Owaisi and Waris Pathan, and lawyer Mehmood Paracha.

"Issue directions to constitute an SIT to look into these hate speeches and take appropriate action. Issue direction to register an FIR against those named in the petition," the petition said.