COVID-19 will be with us for long time, says WHO

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.

Washington, Jun 26: The United States reported more than 39,000 new coronavirus cases on Thursday, its highest-ever single-day count as the government relaxed restrictions and is downplaying the threat of the deadly virus.

According to the Washington Post, experts believe there is a troubling lack of consistent, unified messaging from President Donald Trump and Vice President Mike Pence. They have downplayed the danger and denigrated effective disease defences such as mask-wearing, testing, and social distancing.

Churches, beaches, and bars are filling up with people and so are hospital beds, the report said.

The counties home to Dallas, Phoenix, and Tampa all reported record-high averages on at least 15 straight days in June.

The hardest-hit states are California, Texas, Florida and those that thought they had the virus under control, like Utah and Oregon.

"I think the politicians are in denial," said Kami Kim, director of the Division of Infectious Disease and International Medicine at the University of South Florida.

The chief of the Division of Pediatric Infectious Diseases at the University of Utah Health, Andrew T. Pavia, is of the view that the push to reopen quickly even as cases climb sends a dangerous and inaccurate message.

"On the one hand, you get messages from politicians and the business community that we have to go, go, go and open up," he said. "On the other hand, you're seeing epidemiological indicators that we still have to be very careful."

"It's cognitive dissonance," he added.

The Trump administration has tried to downplay the rising number. Pence called concerns about another surge of infections "overblown," the product of media "fearmongering."

Some governors have followed the administration's lead, blaming rising caseloads on more testing.

Testifying before a congressional committee this week, Anthony S. Fauci, the nation's top infectious-diseases expert, said the new cases were "a disturbing surge" spurred by community transmission rather than testing.

"That's something I'm really quite concerned about," Fauci said. "A couple of days ago, there were 30,000 new infections. That's very disturbing to me."

Several states like Arizona, Arkansas, the Carolinas, Mississippi, Tennessee, Texas and Utah have recently reported new highs in the number of coronavirus patients hospitalized.

"We're seeing a 40 per cent increase in the last two weeks in hospitalizations," said Dallas County Judge Clay Jenkins (D), the jurisdiction's top elected official. "We're by far at our record numbers, and we're at record numbers in north Texas. Houston is at a record, the state is at a record." The Texas Medical Center in Houston, a massive medical complex, reported Thursday that 100 per cent of the beds in its intensive care unit are occupied.

London, Apr 12: British Prime Minister Boris Johnson has thanked the medics and staff of the state-funded National Health Service (NHS) for saving his life after he tested positive for the coronavirus, saying he owed them his life.

In his first public statement since being moved out of the intensive care at St. Thomas’ Hospital in London on Saturday, the 55-year-old Johnson said, “I can't thank them enough, I owe them my life.”

Downing Street has said that Johnson, who completes a week in hospital on Sunday after being shifted there with persistent COVID-19 symptoms, continues to make “very good progress” while on the ward.

Coronavirus India update: State-wise total number of confirmed cases, deaths on April 12

He has been able to take short walks as his doctors monitor his recovery after being moved out of the intensive care and has been watching films and doing puzzles in his hospital bed.

Johnson's fiancee Carrie Symonds, who is pregnant with their first child, is said to have sent him letters and baby scans to lift his spirits during his time in the hospital.

Thousands of get-well-soon cards have also poured in for the prime minister since he went into self-isolation after testing positive for coronavirus over two weeks ago.

Asked about plans for his return to work, UK Home Secretary Priti Patel said on Saturday that the UK PM needed "time and space to rest, recuperate and recover".

The Indian-origin Cabinet minister, who led the daily Downing Street update on the pandemic on Saturday, revealed that the UK had recorded 917 new coronavirus deaths, taking the total deaths in the country to 9,875.

According to the Johns Hopkins University data, the country has nearly 80,000 coronavirus cases.

Patel urged people to stay at home over the Easter weekend to curb the spread of the virus, despite warm and sunny weather across parts of the UK.

“We have given the police powers to enforce the necessary measures we have put in place, including through enforcement fines," said Patel.

"If you don't play your part... our selfless police will be unafraid to act. You will be endangering the lives of your own family, friends and loved ones," she said.

Meanwhile, an Easter message posted on the official 10 Downing Street Twitter account on behalf of the prime minister also urged people to stay at home to save lives.

It read: “Wishing everyone a very happy Easter from Downing Street.

“This year across the country churches will remain closed, and families will spend the day apart. But by staying home, remember, you are protecting the NHS and saving lives.”