Philippines COVID-19 tally exceeds 100,000 with fourth consecutive record breaking rise

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, Mar 29: The number of known coronavirus US cases soared well past 115,000, with more than 1,900 dead, as President Donald Trump said on Saturday he was considering imposing a quarantine on the hard hit New York region.

American healthcare workers in the trenches of the pandemic are appealing for more protective gear and equipment to treat a surge in patients that is already pushing hospitals to their limits in virus hot spots such as New York City, New Orleans and Detroit.

Trump told reporters he could order a quarantine on three states, New York, New Jersey and Connecticut, which between them have recorded at least 64,000 infections and 895 deaths.

He also appeared to soften his previous comments calling for the US economy to be swiftly reopened. Asked whether he thought the United States would restart by Easter Sunday, April 12, Trump replied, "We'll see, what happens."

New York Governor Andrew Cuomo said he had no details on any possible quarantine order for his state, telling a briefing: "I don't even know what that means. I don't know how that would be legally enforceable, and from a medical point of view I don't know what you would be accomplishing."

He said New York was postponing its presidential primary election to June 23, from April 28.

As the crisis deepened, nurses at Jacobi Medical Center in New York's borough of the Bronx protested outside the hospital on Saturday, saying supervisors asked them to reuse personal protective equipment, including masks. Some held signs with slogans including "Protect our lives so we can save yours."

"The masks are supposed to be one-time use," one nurse said, according to videos posted online. "Now, all of a sudden the CDC (Centers for Disease Control and Prevention) is saying that it's fine for us to reuse them. These choices are being made not based on science. They're being made based on need."

One resident at New York Presbyterian Hospital said they were issued with just one mask.

"This is your mask forever. You can bring it home with you. Here's how you can clean your mask," said the resident, who asked not to be named because he was not authorized to speak to the media. "It's not the people who are making these decisions that go into the patients' rooms."

Doctors are also especially concerned about a shortage of ventilators, machines that help patients breathe and are widely needed for those suffering from COVID-19, the pneumonia-like respiratory ailment caused by the highly contagious novel coronavirus.

Hospitals have also sounded the alarm about scarcities of drugs, oxygen tanks and trained staff.

By Saturday afternoon, the US number of cases stood at 115,842 with at least 1,929 deaths, according to a Reuters tally. The United States has had the most recorded cases of any country since its count of infections eclipsed those of China and Italy on Thursday.

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As shortages of key medical supplies abounded, desperate physicians and nurses were forced to take matters into their own hands.

New York-area doctors say they have had to recycle some protective gear, or even resort to bootleg suppliers.

Dr. Alexander Salerno of Salerno Medical Associates in northern New Jersey described going through a "broker" to pay $17,000 for masks and other protective equipment that should have cost about $2,500, and picking them up at an abandoned warehouse.

"You don't get any names. You get just phone numbers to text," Salerno said. "And so you agree to a term. You wire the money to a bank account. They give you a time and an address to come to."

Nurses at Mount Sinai Hospital in New York said they were locking away or hiding N95 respirator masks, surgical masks and other supplies that are prone to pilfering if left unattended.

"Masks disappear," nurse Diana Torres said. "We hide it all in drawers in front of the nurses' station."

One nurse at Westchester Medical Center, in the suburbs of the city, said colleagues have begun absconding with scarce supplies without asking, prompting better-stocked teams to lock masks, gloves and gowns in drawers and closets.

An emergency room doctor in Michigan, an emerging epicenter of the pandemic, said he was wearing one paper face mask for an entire shift due to a shortage and that hospitals in the Detroit area would soon run out of ventilators.

"We have hospital systems here in the Detroit area in Michigan who are getting to the end of their supply of ventilators and have to start telling families that they can't save their loved ones because they don't have enough equipment," the physician, Dr. Rob Davidson, said in a video posted on Twitter.

Sophia Thomas, a nurse practitioner at DePaul Community Health Center in New Orleans, where Mardi Gras celebrations late last month fueled an outbreak in Louisiana's largest city, said the numbers of coronavirus patients "have been staggering."

In the nation's second-largest city, Los Angeles Mayor Eric Garcetti said spiking cases were putting Southern California on track to match New York City's infection figures in the next week.

Washington, Jul 14: The United States has the biggest Covid-19 testing programme in the world, better than big countries like Russia, China, India and Brazil, President Donald Trump said on Monday, asserting that America has "just about the lowest mortality rate" due to the disease in the world.

"We have one of the lowest mortality rates anywhere," Trump said at a White House roundtable. More than 34 lakh Americans have tested positive for Covid-19 so far and over 1,37,000 have died due to the disease, both of which are the largest numbers among all the countries.

The huge number of positive cases, the president said, is due to the massive testing efforts undertaken by his administration, more extensive than any other country.

"We test more than anybody by far. And when you test, you create cases. So we have created cases. I can tell you that some countries, they test when somebody walks into a hospital sick or walks into maybe a doctor's office, but usually a hospital. That is the testing they do, so they do not have cases, whereas we have all these cases. So, it is a double-edged sword," he said.

At the same time, the United States has the lowest mortality rate or just about the lowest mortality rate due to the disease in the world, Trump added. "We are doing a great job. We are doing very well with vaccines and we are doing very, very well with therapeutics. I think we are going to have some very good information coming out soon," he said in response to a question.

"But we have the best and certainly, by far, the biggest testing programme anywhere in the world. If you tested China or Russia or any of the larger countries, if you just tested India, as an example, the way we test, you would see numbers that would be very surprising. Brazil too. You know, Brazil is going through a big problem, but they do not do testing like we do," Trump said.

"So we do the testing and by doing the testing, we have tremendous numbers of cases. As an example, we have done 45 million tests. If we did half that number, you would have half the cases probably -- around that number. If we did another half of that, you would have half the numbers. Everyone would be saying, 'Oh, we are doing so well on cases'," he added.

Responding to a question, Trump said what China did to the world should not be forgotten.

"I think what China has done to the world with what took place -- the China plague -- you can call it the China virus, you can call it whatever you want to call it. It has about 20 different names. What they did to the world should not be forgotten," he said.

The trade deal with China that was signed early this year remains intact, the president said. "It is intact, they (China) are buying. Whether they buy or not, that is up to them. They are buying," he said.