If Congress joined JD(S), result would be different: Mamata

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 27: India on Saturday crossed 5 lakh-mark with record highest spike of 18,552 cases of coronavirus reported in the country in the past 24 hours.

India has added more than 3.18 lakh COVID-19 cases since June 1.

According to the Union Ministry of Health and Family Welfare, this was the highest single-day spike of COVID-19 positive cases. Also, with 384 fatalities in the past 24 hours, the total deaths inched closer to the 16000 mark.

With this, the total number of active cases are 1,97,387 while a total of 2,95,880 people have been cured or discharged from hospitals. The death toll stands at 15685 with one person migrated outside India, according to the health ministry update at 8 am today.

Maharashtra continues to top the countrywide list with a total number of COVID-19 positive cases at 1,52,765.

Delhi has so far reported 77,240 confirmed cases while Tamil Nadu has reported 74622 cases till now, as per the MoHFW. Delhi, Mumbai and Chennai are the worst-hit cities in the country

According to the Indian Council of Medical Research (ICMR), the total number of samples tested up to June 26 is 79,96,707; the number of samples tested on June 26, Friday stands at 2,20,479.

New Delhi, Mar 12: The Supreme Court told the Uttar Pradesh government on Thursday that as of now, there was no law that could back their action of putting up roadside posters of those accused of vandalism during anti-CAA protests in Lucknow.

An apex court bench refused to stay the March 9 Allahabad High Court order directing the Yogi Adityanath administration to remove the posters.

The top court, which grilled the Uttar Pradesh government for putting up such posters in public, described the plea as a matter that needed "further elaboration and consideration".

A vacation bench of justices U U Lalit and Aniruddha Bose said a "bench of sufficient strength" would consider next week the Uttar Pradesh government's appeal against the Allahabad High Court order directing the state administration to remove the posters of those accused of vandalism during anti-CAA protests.

It directed the apex court registry to put up the case file before Chief Justice of India (CJI) S A Bobde so that a "bench of sufficient strength can be constituted at the earliest to hear and consider" the case next week.

During the hearing, the bench told Solicitor General Tushar Mehta, appearing for the Uttar Pradesh government, that it was a matter of "great importance".

It asked Mehta whether the state government had the power to put up such posters.

The top court, however, said there was no doubt that action should be taken against rioters and they should be punished.

Mehta told the court that the posters were put up as a "deterrent" and the hoardings only said that these persons were liable to pay for their alleged acts during the violence.

Senior advocate A M Singhvi, appearing for former IPS officer S R Darapuri whose poster has also been affixed in Lucknow, told the bench that the state was duty-bound to show the authority of law backing its action.

He said the action of the Uttar Pradesh government amounted to a "mega blanket" approach of naming and shaming these persons without final adjudication and it was an open invitation to common men to lynch them as the posters also had their addresses and photographs.