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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.

Jammu, Jan 1: As many as 160 terrorists were killed in Jammu and Kashmir this year, while 250 terrorists, including 102 of Pakistani origin, were active in the Valley, Director General of Police (DGP) Dilbag Singh said on Tuesday, noting that terror incidents and the number of local youths turning towards terrorism have decreased.

"250 terrorists have been active in Jammu and Kashmir. There is a decrease in number of active terrorists as compared to last year," Mr Singh said at the annual press conference at police headquarters in Jammu.

The DGP said that there is 30 per cent fall in terrorist incidents, less civilian killings and 36 per cent decrease in law and order incidents as compared to 2018.

"218 such (local) youths joined militant outfits in 2018 but only 139 joined in 2019," he said. Out of these new recruits only 89 have survived.

"The rest have been eliminated as their shelf life is between 24 hours to 2-3 months after joining militancy. There are hardly few old terrorists surviving, which include Jehangir Saroori and Riyaz Nayikoo", he said.

There have been only 481 law and order incidents this year as compared to 625 last year, he said.

There were 80 per cent successful anti-terror operations in which 160 terrorists, including foreigners, have been killed during the year.

Mr Singh said 102 terrorists have been arrested and 10 terrorists surrendered during the year.

He said that 102 Pakistan origin terrorists are still operating in Kashmir.

"Eleven valiant police personnel from Jammu and Kashmir besides 72 from other other security forces have been martyred," he said.

There was no collateral damage during anti-terror operation as people fully cooperated. "There was zero law and order problem this year (during anti terror operations)," he added.

The DGP said that "there has been a high degree of incidents of infiltration attempts from across the border this year and also ceasefire violations. But security forces have successfully foiled these attempted as 130 infiltrators have entered in 2019 as compared to 143 last year".

He said Jammu and Kashmir Police has set an example by handling the law and order situation in the most "exemplary" way following the abrogation of Article 370 provisions.

It was the biggest challenge faced by the force in 2019, but "we handled the most critical phase in the best way" and there was no civilian casualty during the period, he said.

Dismissing claims of minors being arrested by police in Kashmir, he said that it is being used as propaganda by some people and asserted that the J-K police has acted within the limits of law.

"We are open to scrutiny. The issue reached the Supreme Court which referred it to Jammu and Kashmir high court. The matter was inquired by the HC committee. The SC said that there is no misuse of law by law enforcement agency. J-K police has acted within the limits of law," he said.

Replying to queries on restoration of internet, the DGP said it is under consideration. "I think J-K is moving towards such a situation (on law and order front). Very soon you will hear positive announcement," Mr Singh said.

He said that though some people will try to misuse internet, "in the past, we took care of them and we will take care of such people in the future too".

Internet services in all government-run hospitals and SMS to all mobile phones will be restored from December 31 midnight in the Kashmir Valley, Jammu and Kashmir official spokesman Rohit Kansal said on Tuesday.

On December 10, some short message service (SMS) were enabled on mobile phones in order to facilitate students, scholarship applicants, traders and others. It has now been decided to fully restore the service throughout Kashmir from midnight of December 31, Kansal said.

Mobile Internet services were restored in Kargil district of Ladakh on Friday after remaining suspended for 145 days in the wake of the Centre abrogating provisions of Article 370 of the Constitution, officials said.

Internet services were suspended on August 4, a day before the Centre announced abrogation of Article 370 and division of the state into the union territories of Jammu and Kashmir, and Ladakh.

Washington, Feb 28: US intelligence agencies are monitoring the global spread of coronavirus and the ability of governments to respond, sources familiar with the matter said on Thursday, warning that there were concerns about how India would cope with a widespread outbreak.

While there are only a few known cases in India, one source said the country's available countermeasures and the potential for the virus to spread given India's dense population was a focus of serious concern.

US intelligence agencies are also focusing on Iran, where the country's deputy health minister has fallen ill during a worsening outbreak.

US Secretary of State Mike Pompeo said on Tuesday the United States was "deeply concerned" Tehran may have covered up details about the spread of coronavirus. A US government source said Iran's response was considered ineffective because the government only has minimal capabilities to respond to the outbreak.

Another source said US agencies were also concerned about the weak ability of governments in some developing countries to respond to an outbreak.

The US House of Representatives Intelligence Committee has received a briefing on the virus from the spy agencies. "The Committee has received a briefing from the IC (intelligence community) on coronavirus, and continues to receive updates on the outbreak on a daily basis," an official of the House Intelligence Committee told Reuters.

"Addressing the threat has both national security and economic dimensions, requiring a concerted government-wide effort and the IC is playing an important role in monitoring the spread of the outbreak, and the worldwide response," the official added.

A source familiar with the activities of the Senate Intelligence Committee, led by Republican Senator Richard Burr and Democratic Senator Mark Warner, said the panel was receiving daily updates. The role of US intelligence agencies in responding to the coronavirus epidemic at this point principally involves monitoring the spread of the illness around the world and assessing the responses of governments.

They are working closely with health agencies, such as the US Center for Disease Control, in sharing information they collect and targeting further intelligence gathering.

One source said US agencies would use a wide range of intelligence tools, ranging from undercover informants to electronic eavesdropping tools, to track the virus' impact.