KT Irfan first Indian athlete to qualify for Tokyo 2020

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.

Sydney, Jan 8:  Authorities in Australia will begin five-day campaign to kill thousands of camels in the country as they drink too much water amid the wildfires.  The government will send helicopters to kill up to 10,000 camels in a five-day campaign starting Wednesday, The Hill reported citing The Australian.

Marita Baker, an Anangu Pitjantjatjara Yankunytjatjara (APY) (large, sparsely-populated local government area for Aboriginal Australians) executive board member, said that the camels were causing problems in her community of Kanypi.

"We have been stuck in stinking hot and uncomfortable conditions, feeling unwell, because the camels are coming in and knocking down fences, getting in around the houses and trying to get to water through air conditioners,'' she said.

The planned killing of the camels comes at a time the country is ravaged by wildfires since November. The disaster has killed more than a dozen people and caused the displacement or deaths of 480 million animals, according to University of Sydney researchers.

United Nations, May 20: Highlighting India's long-standing history of promoting inclusive and peaceful societies, a top UN official on Tuesday voiced concern over incidents of "increased hate speech and discrimination" against minority communities in the country following the adoption of the Citizenship Amendment Act.

Under-Secretary-General and UN Special Adviser on the Prevention of Genocide Adama Dieng, however, welcomed Prime Minister Narendra Modi’s call for unity and brotherhood in the wake of the COVID19 pandemic.

Dieng said in a note to the media on Tuesday that he is "concerned over reports of increased hate speech and discrimination against minority communities in India" since the adoption of the Citizenship Amendment Act (CAA) in December 2019.

The Indian government has maintained that the CAA is an internal matter of the country and stressed that the goal is to protect the oppressed minorities of neighbouring countries.

The CAA, which was notified on January 10, grants Indian citizenship to non-Muslim minorities migrated to India from Afghanistan, Pakistan and Bangladesh till December 31, 2014, following persecution over their faith.

"While the objective of the act, to provide protection to minority communities is commendable, it is concerning that this protection is not extended to all groups, including Muslims. This is contrary to India’s obligations under international human rights law, in particular on non-discrimination,” Dieng said.

The Special Adviser recognised "India’s long standing and well recognised history of promoting inclusive and peaceful societies, with respect for equality and principles of non-discrimination.”

He also welcomed recent statements by Prime Minister Modi that the COVID-19 pandemic “does not see race, religion, colour, caste, creed, language or border before striking and that our response and conduct...should attach primacy to unity and brotherhood.”

Dieng encouraged the Government of India to "continue to abide by this guidance by ensuring that national laws and policies follow international standards related to non-discrimination and to address and counter the rise of hate speech through messages of inclusion, respect for diversity and unity.”

He further reiterated that he would continue to follow developments and expressed his readiness to support initiatives to counter and address hate speech.

The hate speech and the dehumanisation of others goes against international human rights norms and values, he added.

“In these extraordinary times brought about by the COVID-19 crisis it is more important than ever that we stand united as one humanity, demonstrating unity and solidarity rather than division and hate,” he said.

Dieng also expressed concern over reports of violence during demonstrations against CAA in some regions of India.