Man attacked with hammer by saffron extremists while transporting meat, cops watch

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, Feb 27: The death toll in the communal violence in northeast Delhi over the amended citizenship law reached 32 on Thursday, senior officials said.

It was at 27 till Wednesday night.

"Five more deaths recorded at GTB Hospital, so death toll at that hospital has gone up to 30, taking total toll to 32," a senior Delhi Health Department official told news agency.

The Lok Nayak Jai Prakash Narayan Hospital had reported two fatalities on Wednesday.

Kozhikode, Apr 28: The remains of seven people who died in the Gulf countries were airlifted from Dubai by a cargo flight which arrived here Tuesday, ending the uncertainty over bringing back the bodies of those who died following non-Covid-19 reasons.

Airport sources said the flight reached the airport by around noon.

The bodies include natives of Kerala, one each of people from Goa and Sivaganga in Tamil Nadu.

"Karipur in among the few airports where cargo flights are operating in South India.

This is the reason why the bodies of those belonging to Goa and Sivaganga and other parts of Kerala have all been brought here for onward transport to respective destinations by road," an airport official said.

"As per information received from the airport, the bodies are of John Johannan of Kollam, David Shamy of Punnakkal, Kannur, Sathyan of Cheranelloor, Thrissur, O C Mathai and Sijo Joy, both of Pathanamthitta, Sreenivasan of Sivaganga and Henrick D Soza of South Goa," said Thomas, Assistant Sub Inspector, Special Branch CID, Malappuram.

Special passes have been issued to ambulances to transport the bodies to their destinations after the formalities at the airport are over, a senior police officer said.

There had been some confusion on bringing back the bodies from the Gulf region for about a week for want of clearance from the embassy authorities.

Chief Minister Pinarayi Vijayan had written to Prime Minister Narendra Modi last week seeking his intervention in ensuring that bodies of Keralites, who die in Gulf countries due to no non COVID-19 reasons, should be broughtto the state without any delay forenabling family members to perform their last rites.

Vijayan also wanted Modi to direct Indian Embassies to issue necessary clearances without seeking individual approvals from the Ministry of Home Affairs and avoid any delay.

The mortal remains are now being broughtin cargo planes as passenger flights are not being operated due to the COVID-19 lockdown.