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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, Jun 15: With an increase of 11,502 cases in the past 24 hours, the COVID-19 count in India reached 3,32,424 on Monday, according to the Union Health and Family Welfare Ministry.

The spike is marginally lower than the highest-ever spike of 11,929 new cases the country registered a day earlier.

With 325 deaths being reported from across the country, the toll due to COVID-19 has now reached 9,520.

The COVID-19 count includes 1,53,106 active cases while 1,69,798 patients have been cured and discharged or migrated so far.

Maharashtra with 1,07,958 cases continues to be the worst-affected state in the country with 53,030 active cases while 50,978 patients have been cured and discharged in the state so far. 3,950 deaths have been reported due to the infection so far from Maharashtra.

It is followed by Tamil Nadu with 44,661 cases and the national capital with 41,182 confirmed cases.

Amaravati, Mar 16: Andhra Pradesh Chief Minister YS Jagan Mohan Reddy said that paracetamol is the only medication for coronavirus.

He said that COVID-19 is lethal for those have comorbid conditions including blood pressure, asthma and kidney diseases.

"There is no need to get panic about Coronavirus. Its impact is majorly on senior citizens aged above 60 years. It is dangerous to those suffering from diabetes, blood pressure, asthma and kidney diseases. For others, it is not so much dangerous. And paracetamol is the only medication for coronavirus," Reddy said on Sunday while addressing a press conference on the postponing of the local body elections as coronavirus cases continue to rise.

"In case anybody coming from foreign countries is found suffering from cough, cold and fever, bleaching powder should be sprayed on their belongings and things they use. The government is creating awareness on such precautions," he added.

Reddy slammed the State Election Commissioner's decision of postponing the local body elections for six weeks and alleged that the SEC was acting at the behest of TDP chief N Chandrababu Naidu.

The opposition has targeted Reddy on his statement, saying the chief minister is behaving "ignorantly" and "irresponsibly" on the issue of coronavirus.

"While Telangana CM had changed his stand and closed shops and theatres in his state, Jagan Reddy is speaking as if there is no need for any panic. This CM is behaving ignorantly and irresponsibly," said Naidu.

Andhra Pradesh has reported one case of coronavirus. The total number of confirmed COVID-19 cases across India has risen to 110.