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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.

Thiruvananthapuram, Apr 20:  Kerala Chief Minister Pinarayi Vijayan on Monday said that the government would revoke the order, which allowed the opening of barbershops and restaurants in the State.

The development comes after the Ministry of Home Affairs (MHA) objected to the move.
When asked about the letter issued by the MHA terming certain decisions as to the dilution of guidelines, Chief Minister Vijayan said: "There is no confrontation between the State government and the Centre."

"Kerala is following all directions issued by the Centre. Barbershops will not be opened and restaurants will only provide online delivery," he told the reporters, adding that public transport would not be allowed.

"There was a decision to open barbershops but many experts have pointed out against the decision. So the Kerala government is withdrawing the decision," he said.

Earlier, Chief Secretary Tom Jose said that if needed, then the State government will make necessary modifications to the lockdown guidelines in the wake of a communication received from the Central government.

The MHA had objected to the decision of Kerala government to allow services like barbershops, local workshops, restaurants, etc., and had urged the State government to revise its lockdown guidelines.

The Government of India had said that violation to lockdown measures reported posed a serious health hazard to the public and risk the spread of COVID-19.

Union Home Secretary Ajay Bhalla wrote to all Chief Secretaries and a separate letter had been sent to the Kerala Chief Secretary asking them not to dilute lockdown guidelines in any manner.

In his letter to the Kerala Chief Secretary, Bhalla had stated that the consolidated revised guidelines on the measures to be taken by the Ministries/Departments of the Government of India has been circulated on April 15 for containment of COVID-19.

Kerala Minister Kadakampally Surendran had said that relaxations have been given abiding by the direction issued by the Central government. He had added that the Centre may have asked for an explanation due to some misunderstanding.

India is under a nation-wide lockdown that came into force on March 25 to contain the spread of coronavirus, which has claimed 559 lives in the country. Last week, Prime Minister Narendra Modi announced the extension of lockdown till May 3.

Raipur, Jan 9: An outbreak of bird flu has been reported from a state-run poultry farm in Chhattisgarh's Korea district, prompting the authorities to cull over 15,000 birds and step up vigil on poultry birds within 10 km radius of the affected area, officials said on Thursday.

So far, 15,426 chickens and quails have been culled and 30,000 eggs destroyed after the highly contagious H5N1 virus was detected among birds at the poultry farm and hatchery in Baikunthpur town, located around 300 km from here, they said.

There has been no case of infection in humans so far due to the outbreak of avian influenza, they said.

"After some chickens and quails were found dead on December 7 last year in the farm, their samples were collected and sent to local laboratories for testing," Dr R S Baghel, deputy director, veterinary department, Korea, told news agency.

When the disease was not properly detected, samples were further sent to Jabalpur in Madhya Pradesh where veterinarians suggested symptoms of chronic respiratory disease, following which their line of treatment was followed.

"Despite the treatment, the abnormal deaths of birds continued," Baghel said.

Later, the samples were sent to Bhopal-based National Institute of High-Security Animal Diseases where tests were found positive for the H5N1 virus on December 23, he said.

"Immediately after getting reports of bird flu, we took permission from the Korea district administration, as per the standard procedure, and culled all 15,426 birds (chickens and quails) and destroyed 30,000 eggs in the farm and its adjoining areas," the official said.

Of the total culled birds, nearly 641 chickens were being reared by locals within one km radius of the farm. The locals were given compensation for the culling of their birds, he said.

"We have completed the culling process and sealed the farm. After sanitising the area in 10 km of its radius, we submitted a report to the state's directorate of veterinary services on Wednesday," Baghel said.

"No human has been affected due to the outbreak and the situation is under control. We are waiting for further directives from the higher authorities," he said.

The official said for the next three months, they will be conducting surveillance in 10 km radius of the affected area during which blood samples of birds will be regularly sent to Bhopal for testing.

"We will continue our observation for next three months," he added.

Meanwhile, state veterinary services director C R Prasanna said, "No human has so far been affected due to avian influenza and workers at the poultry farm at Baikunthpur have been given medicines as a precautionary measure."

Nearly 40 villages fall within the purview of 10 km radius of the affected area from where random sampling of poultry birds will be done for next three months to check whether they are infected with avian influenza, he said.

"Necessary steps are being taken to prevent bird flu from spreading to other areas," he added.