Kerala floods: 33,000 people rescued; 6.33 lakh people in relief camps

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.

The World Health Organisation (WHO) on Saturday launched a Health Alert on WhatsApp where over 1.5 billion users can ask questions and they will be provided with reliable information about new coronavirus 24/7.

This will also serve government decision-makers by providing the latest numbers and situation reports, WhatsApp said in a statement.

To contact the WHO Health Alert, save the number +41 79 893 1892 in phone contacts, and then simply text the word 'Hi' in a WhatsApp message to get started.

The service responds to a series of prompts and will be updated daily with the latest information.

"You can also visit the WhatsApp Coronavirus Information Hub at whatsapp.com/coronavirus," and click on the WHO link on the homepage to open up a chat with the WHO Health Alert if you have WhatsApp installed," said the micro-blogging platform.

The WHO Health Alert will provide official information on topics such as how to protect yourself from infection, travel advice, and debunking new coronavirus myths.

The service is initially launching in English but will be available in all six languages within the coming weeks (English, Arabic, Chinese, French, Russian and Spanish.)

"Digital technology gives us an unprecedented opportunity for vital health information to go viral and spread faster than the pandemic. We are proud to have partners like Facebook and WhatsApp, that are supporting us in reaching billions of people with important health information," said Dr Tedros Adhanom Ghebreyesus, Director-General of the WHO.

The WHO Health Alert is the latest official NGO or government helpline to become available on WhatsApp, joining the Singapore Government, The Israel Ministry of Health, the South Africa Department of Health, and KOMINFO Indonesia.

Earlier this week, WhatsApp, in partnership with the World Health Organization, UNICEF, and UNDP, launched the WhatsApp Coronavirus Information Hub. The hub offers general tips and resources for users around the world to reduce the spread of rumours and connect with accurate health information.

WhatsApp also announced a $1 million grant to the International Fact Checking Network to support fact-checking for the #CoronaVirusFacts Alliance.

Kochi, Jan 22: The Left front government in Kerala on Monday decided to inform the Centre it would not cooperate with the updation of the NPR, saying there were fears among the public about the process and it has the "Constitutional responsibility" to alleviate them and ensure law and order.

A special cabinet meeting, chaired by Chief Minister Pinarayi Vijayan here, decided to inform the Registrar General and Census Commissioner under the Union Home Ministry that it was unable to cooperate with anything with regard to the updation of the NPR.

"The decision was taken as it was the Constitutional responsibility of the government to alleviate the fears of general public and ensure law and order situation in the state," a Chief Minister's Office release said.

However, the state would fully cooperate with the census procedures, it said.

The LDF government, which has been on a warpath against the Centre over the Citizenship Amendment Act, has last month stayed all activities related to updation of NPR, considering 'apprehensions' of public that it would lead to NRC in the wake of the controversial CAA.

"As the NPR is a process that leads to the National Register of Citizens (NRC), there is a sense of fear among the people that its implementation could lead to widespread insecurity", the CMO release said on Monday.

The experience of the state which had already compiled the NRC was an example for this, it added, in apparent reference to Assam.

Kerala had already stopped all procedures regarding the NPR updation, the release said adding there was also a report of the state police that the if the government went ahead with the procedures, it would adversely impact the law and order situation.

The district collectors have also informed the government that the Census procedures would be affected if the updation of the NPR was done along with it, the CMO release said.

The CPI(M)-led LDF government had recently convened a meeting of political parties and socio-religious organisations here on December 29 in the wake of the concerns among people in various stratas of the society, it said.

A special assembly session was convened and a resolution was passed requesting the Centre not to implement the CAA and the government had also approached the apex court against the law, it added.