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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.

New Delhi/Washington, Feb 14: India has offered to partially open up its poultry and dairy markets in a bid for a limited trade deal during US President Donald Trump's first official visit to the country this month, people familiar with the protracted talks say.

India, the world's largest milk-producing nation, has traditionally restricted dairy imports to protect the livelihoods of 80 million rural households involved in the industry.

But Prime Minister Narendra Modi is trying to pull all the stops for the US President's February 24-25 visit, aimed at rebuilding bonds between the world's largest democracies.

In 2019, President Trump suspended India's special trade designation that dated back to 1970s, after PM Modi put price caps on medical devices, such as cardiac stents and knee implants, and introduced new data localization requirements and e-commerce restrictions.

President Trump's trip to India has raised hopes that he would restore some of the country's US trade preferences, in exchange for tariff reductions and other concessions.

The United States is India's second-largest trade partner after China, and bilateral goods and services trade climbed to a record $142.6 billion in 2018. The United States had a $23.2 billion goods trade deficit in 2019 with India, its 9th largest trading partner in goods.

India has offered to allow imports of US chicken legs, turkey and produce such as blueberries and cherries, government sources said, and has offered to cut tariffs on chicken legs from 100 per cent to 25 per cent. US negotiators want that tariff cut to 10 per cent. The Modi government is also offering to allow some access to India's dairy market, but with a 5 per cent tariff and quotas, the sources said. But dairy imports would need a certificate they are not derived from animals that have consumed feeds that include internal organs, blood meal or tissues of ruminants.

New Delhi has also offered to lower its 50 per cent tariffs on very large motorcycles made by Harley-Davidson, a tax that was a particular irritant for President Trump, who has labelled India the "tariff king." The change would be largely symbolic because few such motorcycles are sold in India.

President Trump will be feted in PM Modi's home state of Gujarat, then hold talks in New Delhi and attend a reception that the hosts have promised will be bigger than the one organised for former president Barack Obama in 2015.

But it is far from clear whether India's offers will be enough to satisfy US Trade Representative Robert Lighthizer, who cancelled plans for a trip to India this week. Instead, he has held telephone talks with Commerce Minister Piyush Goyal.

The US dairy industry remained sceptical on Thursday that a viable deal is at hand.

"We're always looking for market access, but in terms of India, as of today I'm not aware of any real progress going on," said Michael Dykes, president of the International Dairy Foods Association and a member of USTR's agricultural trade policy advisory committee.

Mr Dykes said the US dairy industry was looking for access in viable commercial quantities.

A USTR spokesman and India's trade ministry did not respond to requests for comment.

A parliament panel is reviewing a draft data privacy law that imposes stringent controls over cross-border data flows and gives the government powers to seek user data from companies.

It is not clear whether it will be passed, or in what form, but the possibilities have unnerved US companies and could raise compliance requirements for Google, Amazon.com Inc, and Facebook.

The draft law is not part of the trade discussions, Indian officials say, because the issue is too difficult to resolve at the same time.

"The privacy and localization piece will be raised independently and in concert with the trade discussions," said a Washington-based source with knowledge of the US administration's thinking.

President Trump on Tuesday was non-committal about sealing a trade deal before his visit. "If we can make the right deal, we'll do it," he told reporters.

Two US sources said progress had been made on proposed alterations to the medical device price caps. India's new import tariffs on medical devices, walnuts, toys, electronics and other products on February 1 surprised US negotiators, however.

The new tariffs were aimed at China, which also makes medical devices, according to an Indian government source. "We have to protect our market and our companies," the source said.

Washington, Jan 2: The number of people killed in large commercial airplane crashes fell by more than 50% in 2019 despite a high-profile Boeing 737 MAX crash in Ethiopia in March, a Dutch consulting firm said on Wednesday. Aviation consulting firm To70 said there were 86 accidents involving large commercial planes - including eight fatal incidents - resulting in 257 fatalities last year. In 2018, there were 160 accidents, including 13 fatal ones, resulting in 534 deaths, the firm said.

To70 said the fatal accident rate for large airplanes in commercial passenger air transport was just 0.18 fatal accident per million flights in 2019, or an average one fatal accident every 5.58 million flights, a significant improvement over 2018. The fatality numbers include passengers, air crew such as flight attendants and any people on the ground killed in a plane accident

Large passenger airplanes in the study are aircraft used by nearly all travelers on airlines worldwide but excludes small commuter airplanes in service, including the Cessna Caravan and some smaller turboprop airplanes, according to To70.

On Dec. 23, Boeing's board said it had fired Chief Executive Dennis Muilenburg after a pair of fatal crashes involving the 737 MAX forced it to announce it was halting output of its best-selling jetliner. The 737 MAX has been grounded since March after an October 2018 crash in Indonesia and the crash of a MAX in Ethiopia in March killed a total of 346 people.

To70 said the aviation industry spent significant effort in 2019 "focusing on so-called 'future threats' such as drones." But the MAX crashes "are a reminder that we need to retain our focus on the basics that make civil aviation so safe: well-designed and well-built aircraft flown by fully informed and well-trained crews."

The Aviation Safety Network said on Wednesday that, despite the MAX crash, 2019 "was one of the safest years ever for commercial aviation." The 157 people killed in March on Ethiopian Airlines Flight 302 accounted for more than half of all deaths last year worldwide in passenger airline crashes.

Over the last two decades, aviation deaths around the world have been falling dramatically even as travel has increased. As recently as 2005, there were 1,015 deaths aboard commercial passenger flights worldwide, the Aviation Safety Network said.

Last week, 12 people were killed when a Fokker 100 operated by Kazakh carrier Bek Air crashed near Almaty after takeoff. In May, a Russian Sukhoi Superjet 100 aircraft caught fire as it made an emergency landing at Moscow’s Sheremetyevo airport, killing 41 people.

The figures do not include accidents involving military flights, training flights, private flights, cargo operations and helicopters.