Muslims continue protest against demolition of mosque in China

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: An Indian Air Force aircraft on Thursday evacuated 76 Indians and 36 foreign nationals from the coronavirus-hit Chinese city of Wuhan.

The C-17 Globemaster III transport aircraft was sent to Wuhan on Wednesday and it carried 15 tonnes of medical supplies for coronavirus-affected people in China.

On its return, the aircraft brought back 112 people, including 23 citizens from Bangladesh, six from China, two each from Myanmar and the Maldives and one each from South Africa, the US and Madagascar.

Earlier, India had evacuated around 650 Indians from Wuhan in two Air India flights.

“In all 723 Indian nationals and 43 foreign nationals have been evacuated from Wuhan, China, in these three flights,” the Ministry of External Affairs (MEA) said.

On the medical supplies delivered by India to China, the MEA said they would help augment the country’s efforts to control the coronavirus outbreak which had been declared as a public health emergency by the World Health Organisation.

“The assistance is also a mark of friendship and solidarity from the people of India towards the people of China as the two countries also celebrate 70th anniversary of establishment of diplomatic relations this year,” it said.

Mumbai, Jul 16: Poet-activist Varavara Rao has tested positive for Covid-19. The 80-year old, named as accused in the Elgar Parishad case, was shifted to state-run JJ Hospital from Taloja central jail where he was lodged after he complained of dizziness. The hospital conducted tests including one for Covid-19 the results for which confirmed that he is positive.

Dr Ranjit Mankeshwar, the dean of JJ Hospital said, “He has shown no symptoms of Covid-19 so far. He has no breathing difficulty and is stable. We will soon shift him to a Covid hospital.” Rao is likely to be shifted to St George hospital.

Last week, Rao’s family had held a press conference after receiving a call from him from prison. His family had then said that his condition was deteriorating and he should be provided immediate medical aid. He was earlier shifted to the hospital when he fell unconscious in jail in May but was discharged within three days. The family had said that he was not provided proper medical treatment.

Last month, a special court had rejected his interim bail plea where he had cited his susceptibility to the virus due to his age and other medical conditions. The court, however, had said the superintendent of prison has been directed to take appropriate measures in such cases where medical attention is required. Before he was shifted to the hospital on Tuesday, Rao was admitted to the hospital ward of the jail and as he had been unable to do basic chores without depending on other inmates.

An appeal against the special court’s order is pending before the Bombay High Court. The plea is likely to be heard tomorrow.