Obama shouts at crowd to defend Trump supporter at rally

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 death toll in China's coronavirus rose sharply to 425 with 64 deaths on Monday alone while 3,235 new confirmed cases were reported, taking the number of those infected with the deadly disease to 20,438, Chinese health authorities said on Tuesday.

The 64 people who died on Monday were all from the Hubei province, the epicentre of the virus, China's National Health Commission said.

Also, 3,235 new confirmed cases of novel coronavirus infection were reported, a big increase in a day.

Another 5,072 new suspected cases were reported on Monday, said the commission, adding that 492 patients became seriously ill.

The commission said that 2,788 patients remained in severe condition and 23,214 people were suspected of being infected with the virus, a pointer that it is increasingly turning virulent.

The overall confirmed cases on the Chinese mainland had reached 20,438 by the end of Monday, the commission said, noting that a total of 425 people had died of the disease.

A total of 632 people had been discharged from hospital after recovery, state-run Xinhua news agency reported As the virus spreads from human to human, 221,015 close contacts had been traced, with 171,329 others still under medical observation.

By the end of Monday, 15 confirmed cases had been reported in Hong Kong, eight in the Macao and 10 in Taiwan.

The Philippines reported the first overseas death from the virus on Sunday while 148 cases have been reported from abroad.

India has reported three cases of the coronavirus. All the three patients from Kerala recently returned from the affected Wuhan city.

Currently, 647 Indians and seven Maldivians who have been evacuated from Wuhan and Hubei are in 14-day quarantine at a medical camp in Manesar, near Delhi.

As the virus continued to spread at an alarming rate, Chinese President Xi Jinping on Monday warned officials of punishment if they shirked responsibility in tackling the virus outbreak.

On Monday, China has opened a 1,000-bed hospital built in record nine days in Wuhan city and started trials for new drug to contain the virus and is set to open another 1,300 bed hospital next to it on Wednesday.

The ruling Communist Party of China on Monday held its political bureau meeting presided by President Xi to review the steps being taken on various fronts to halt the spread of the deadly virus.

The outcome of the epidemic prevention and control directly affects people's lives and health, the overall economic and social stability and the country's opening-up, Xi said.

"Those who disobey the unified command or shirk off responsibilities will be punished," Xi was quoted as saying by the state-run Xinhua news agency.

Xi said that the party and government leaders supervising them would also be held accountable in severe cases.

Chinese armament firms, including those building aircraft carrier and military aircraft, have postponed planned work in order to concentrate on controlling the risk of coronavirus, state-run Global Times reported.

Noted Chinese health expert Zhong Nanshan has said that based on the fresh evidence, the novel coronavirus, which is spreading rapidly in China and the world, may reach its peak in the next 10 to 14 days, contrary to earlier estimates of climaxing sooner.

This means that the cases would drastically increase in the next two weeks before slowing down.

Also, China has begun clinical trials to test a drug to treat the patients of the coronavirus which till now has no cure.

Currently, patients are being treated with a combination of antivirals and other measures, as scientists race to find a vaccine.

Some reports said drugs to treat HIV too was being tried to treat the patients.

The experimental antiviral drug, Remdesivir, to be tested in field trials is developed by US-based Gilead Sciences. It is aimed at treating infectious diseases such as Ebola and SARS, South China Morning Post reported.

It was given to the first US patient last week - a 35-year-old man whose condition appeared to improve within a day, it said.

Washington, Jun 27: Facebook has said that it will flag all "newsworthy" posts from politicians that break its rules, including those from President Donald Trump.

Separately, Facebook's stock dropped more than 8 per cent, erasing roughly USD 50 billion from its market valuation, after the European company behind brands such as Ben & Jerry's and Dove announced it would boycott Facebook ads through the end of the year over the amount of hate speech and divisive rhetoric on its platform.

Later in the day, Coca-Cola also announced it joined the boycott for at least 30 days.

CEO Mark Zuckerberg had previously refused to take action against Trump posts suggesting that mail-in ballots will lead to voter fraud, saying that people deserved to hear unfiltered statements from political leaders.

Twitter, by contrast, slapped a "get the facts" label on them.

Until Friday, Trump's posts with identical wording to those labelled on Twitter remained untouched on Facebook, sparking criticism from Trump's opponents as well as current and former Facebook employees.

Now, Facebook is all but certain to face off with the president the next time he posts something the company deems to be violating its rules.

"The policies we're implementing today are designed to address the reality of the challenges our country is facing and how they're showing up across our community," Zuckerberg wrote on his Facebook page announcing the changes.

Zuckerberg said the social network is taking additional steps to counter election-related misinformation.

In particular, the social network will begin adding new labels to all posts about voting that will direct users to authoritative information from state and local election officials.

Facebook is also banning false claims intended to discourage voting, such as stories about federal agents checking legal status at polling places.

The company also said it is increasing its enforcement capacity to remove false claims about local polling conditions in the 72 hours before the US election.

Ethan Zuckerman, director of the Massachusetts Institute of Technology's Center for Civic Media, said the changes are a "reminder of how powerful Facebook may be in terms of spreading disinformation during the upcoming election".

He said the voting labels will depend on how good Facebook's artificial intelligence is at identifying posts to label.

"If every post that mentions voting links, people will start ignoring those links. If they're targeted to posts that say things like 'Police will be checking warrants and unpaid traffic tickets at polls' a classic voter suppression disinfo tactic and clearly mark posts as disinfo, they might be useful," he said.

But Zuckerman noted that Facebook "has a history of trying hard not to alienate right-leaning users, and given how tightly President Trump has aligned himself with voter-suppressing misinfo, it seems likely that Facebook will err on the side of non-intrusive and ignorable labels, which would minimize impact of the campaign."

Earlier in the day, shares of Facebook and Twitter dropped sharply after consumer-product maker Unilever announced a new ad boycott on Facebook, Twitter and Instagram through at least the end of the year.

The European company said it took the move to protest the amount of hate speech online.

Unilever said the polarised atmosphere in the United States ahead of November's presidential election placed responsibility on brands to act.

In addition to the decline in Facebook shares, Twitter ended the day more than 7 per cent lower.

Unilever, which is based in the Netherlands and Britain, joins a raft of other advertisers pulling back from online platforms.

Facebook in particular has been the target of an escalating movement to withhold advertising dollars to pressure it to do more to prevent racist and violent content from being shared on its platform.

"We have decided that starting now through at least the end of the year, we will not run brand advertising in social media newsfeed platforms Facebook, Instagram and Twitter in the U.S.," Unilever said.

"Continuing to advertise on these platforms at this time would not add value to people and society."

Facebook did not immediately respond to a request for comment. On Thursday, Verizon joined others in the Facebook boycott.

Unilever "has enough influence to persuade other brand advertisers to follow its lead," said eMarketer analyst Nicole Perrin.

She noted that Unilever pulled back spending "for longer, on more platforms (including Twitter) and for more expansive reasons" in particular, by citing problems with "divisiveness" as well as hate speech.

Sarah Personette, vice president of global client solutions at Twitter, said the company's "mission is to serve the public conversation and ensure Twitter is a place where people can make human connections, seek and receive authentic and credible information, and express themselves freely and safely."

She added that Twitter is "respectful of our partners' decisions and will continue to work and communicate closely with them during this time."